5 research outputs found
Die Stoffwechselwirkungen der SchilddrĂĽsenhormone
- Author
- A Cervantes-Amezcua
- A Hecht
- A Kratinoff
- A Loubatieres
- A Magnus-Levy
- A Magnus-Levy
- A Renauld
- A Renauld
- A Rudy
- A Trisotto
- A Vinik
- A Weinstein
- AD Toft
- AF Abt
- AF Debons
- AF Debons
- AI Vinik
- AJ Boekelman
- AM Cohen
- B Jeanrenaud
- B Kadenbach
- B Romeis
- BA Houssay
- BA Houssay
- BA Houssay
- BA Lamberg
- BB Brodie
- BB Jacobsen
- BH Landing
- BH Marks
- BJ Boucher
- BJ Sanger
- C Blum
- C Martius
- C Martius
- C Martius
- C Mattonet
- C Moses
- C Pitra
- C Rich
- CA Basedow von
- CD Holdsworth
- CD Kochakian
- CD Marsden
- CN Hales
- CR Pickardt
- D Andreani
- D Andreani
- D Andreani
- D Deykin
- D Fetter
- D Fetter
- D Klink
- D Marine
- D Mceachern
- D Porte
- DE Bernstein
- DE Holtkamp
- DH Hanscom
- DN Baron
- DP Foster
- DR Challoner
- DS Amatuzio
- DS Munro
- E Abderhalden
- E Cerasi
- E Goetsch
- E Nieschlag
- E Wertheimer
- E Wertheimer
- EA Nikkila
- EF DuBois
- EF Pfeiffer
- EJ Wayne
- EP Joslin
- EP Joslin
- ER Ramey
- ES Gordon
- F Baumgarten
- F Berti
- F Chatagner
- F Meythaler
- F MĂĽller
- F Sandhofer
- F Sandhofer
- F Sandhofer
- F Sandhofer
- FB Byrom
- FB Thomas
- FL Hoch
- FL Hoch
- FL Hoch
- FM Kenny
- G Ambrus
- G Burke
- G Haben
- G Howitt
- G Krishna
- G Kronenberg
- G Löffler
- G Menzinger
- G Pagni
- G Rothenbuchner
- G Strauch
- G Tibbling
- GD Abrams
- GE Glock
- GG Hofmann
- GG Hofmann
- GI Portnay
- GJ Hamwi
- H Berg
- H Bibergeil
- H Brauman
- H Brown
- H Daweke
- H Elrick
- H Frey
- H Iwatsubo
- H McGillivray
- H Schulz
- H SchĂĽmann
- H Wieland
- HA Lardy
- HC Coggeshall
- HE Swanson
- HF Root
- HH Bode
- HJ John
- HJ John
- HJ Karl
- HJ Quabbe
- HK Bartelheimer
- HS Margolius
- HW Bansi
- I Abelin
- I Böttger
- I Portioli
- I Potop
- I Singh
- IA Mirsky
- IL Schwartz
- J Brown
- J Brown
- J Comsa
- J Holst
- J Kellen
- J Kellen
- J Lerman
- J Nerup
- J Nolte
- J Pirart
- J Smith
- J Weeke
- JA Burgess
- JB Schoot van der
- JC Savoie
- JE White
- JE White
- JF Bridgman
- JF Regan
- JG Wiswell
- JH Hagen
- JH Hagen
- JH Means
- JH Shah
- JH Shah
- JJ Canary
- JJ Rupp
- JL Gabrilove
- JM Hershman
- JM Hershman
- JM Moore
- JN Fisher
- JO Achelis
- JP Felber
- JP Rado
- JR Bronk
- JS McGuire
- JS Staffurth
- JW Finkelstein
- JW Young
- JWH Doar
- K Gail
- K Helmke
- K Jahnke
- K Kirkeby
- K Kreines
- K Kreines
- K Oberdisse
- K Schemmel
- K Schimke
- K Schwarz
- KA Woeber
- KP Braun
- L Abelin
- L Hellman
- L Macho
- L Macho
- L Maret
- L Mikulay
- LA Menahan
- LD Garren
- LJ Levy
- LR Mandel
- LV Perlman
- M Eller
- M Gold
- M Heimberg
- M Inada
- M Iversen
- M Lakin
- M L’Hermite
- M Minozzi
- M Schieche
- M Schieche
- M Sendrail
- M Vaughan
- MC Balodimos
- MD Pettit
- ME Levin
- MF Goodkind
- MI Abrams
- MJ Spiro
- MM Martin
- MR Harrison
- MT Nishikawara
- MT Nishikawara
- MT Nishikawara
- N Bargoni
- N Bargoni
- N Bargoni
- N Bargoni
- N Bargoni
- N Bargoni
- N Bargoni
- N Svedmyr
- NF Maclagan
- NJ Elgee
- NS Halmi
- NS Skinner
- O Bösl
- OP Chilson
- OS Dow
- P Avogaro
- P Dieterle
- P Gorden
- P Linquette
- P Troen
- PA Bastenie
- PC Scriba
- PC Scriba
- PC Scriba
- PD Brewsher
- PJ Randle
- PM LeCompte
- PS Rosenfeld
- PS Rosenfeld
- PT Dillon
- R Bressler
- R Cereijo-Santalo
- R Clayton
- R Farrant
- R Fitz
- R Fraser
- R Sternheimer
- RA Freedland
- RA Freedland
- RA Jackson
- RB Hunton
- RC Grauer
- RD Utiger
- RE Peterson
- RIS Bayliss
- RJ Graves
- RL Marecek
- RM Wilder
- RM Wilder
- RM Wilder
- RO Scow
- RP Eaton
- RP Eaton
- RS Gordon
- RS Gordon
- RS Yalow
- RTT Yeung
- RW Hanson
- S Banerjee
- S Ellis
- S Halevy
- S Kuriyama
- S Laurell
- S Murad
- S Nissley
- S Raptis
- S Raptis
- S Raptis
- S Rinkoff
- S Schapiro
- S Simkins
- SA D’Angelo
- SB Barker
- SB Beaser
- SC Werner
- SD Burton
- SD Burton
- SL Leonard
- SL Leonard
- SM Glick
- SS Stoffer
- SW Berkheiser
- T BĂĽcher
- T Crawford
- T Fukui
- T Jakobson
- T Kanaghinis
- TCB Stamp
- TE Gaffney
- TH McGavack
- TH McGavack
- TK Birkle
- TL Althausen
- TL Althausen
- TS Danowski
- TS Danowski
- TS Danowski
- TS Danowski
- U Rosenqvist
- U Rosenqvist
- U Rosenqvist
- UJ Lewis
- V Felt
- V Felt
- V Kubista
- V Londong
- VA Drill
- VA Drill
- VK Hopsu
- VN Slavnov
- W Cramer
- W Falta
- W Grab
- W Hochheuser
- W Hochheuser
- W Hochheuser
- W Losert
- W Seegers
- WD Odell
- WG Baronoff
- WJ Griffiths
- WJ Irvine
- WJ Malaisse
- WJH Butterfield
- WL Miller
- WM Balfour
- WR Beisel
- WR Beisel
- WR Brewster
- WR Harlan
- WR Ruegamer
- WR Wilson
- WR Wilson
- WW Lukensmeyer
- WW Westerfeld
- Y Kato
- YP Lee
- YP Lee
- Publication venue
- Ludwig-Maximilians-Universität München
- Publication date
- 01/01/1975
- Field of study
Mittel mit Wirkung auf den Verdauungstraktus
- Author
- A Baeyer
- A Bayer
- A Bernthsen
- A Brissemoret
- A Butenandt
- A Eppenauer
- A Gluschke
- A Heffter
- A Koeppen
- A Ogata
- APT Easson
- AR Battersby
- BL Schwarz
- C Pak
- CD Hurd
- CW Rawson
- D Linden
- D’Antoni
- E Finke
- E Phillipot
- E Slade
- E Ziegler
- EA Sharp
- EC Faust
- EC Faust
- EH Cox
- F Berg
- F Eichholz
- F Oestreicher
- F Schwarz
- FL GrĂĽnberg
- G Bornmann
- GO Schenk
- H Brockmann
- H Dieterle
- H Mendheim
- H Schoene
- H Staudinger
- H Vieth
- H Vollmer
- Hammer
- HH Schneider
- HP Kaufmann
- HP Kaufmann
- HP Kaufmann
- HP Kaufmann
- HP Kaufmann
- HP Kaufmann
- HW Brown
- I Hildenbrandt
- IL Ambrus
- J Hoffmann
- JJ Abel
- JV Supniewski
- JW Lemaistre
- JW Morgan
- K Bodendorf
- K Schattmann
- K Schulze
- K Seelkopf
- KC Kauer
- KG Krebs
- KW Rosenmund
- KW Rosenmund
- KW Rosenmund
- L Emmel
- L Hänel
- L Hänel
- L Hänel
- L Kauftheil
- L Lendle
- L Mitchell
- LN Gay
- LW Butz
- LW Butz
- M Pailer
- M Serafinowa
- Marcenac
- Milbantin
- Miller
- MJ Grossman
- N Brock
- O Gross
- O Thomas
- O Wallach
- O Zeidler
- P Bouchereau
- P Duquenois
- PD Lamson
- PD Lamson
- PD Lamson
- PD Lamson
- PD Lamson
- PD Lamson
- R Ammon
- R Ammon
- R Domenjoz
- R Gottlieb
- R Wiesmann
- S Takei
- TA Henry
- W Awe
- W Awe
- W Awe
- W Rathje
- W Schulemann
- W SchĂĽffner
- W Siehe
- W Straub
- WH Kuegeberg
- WH Wright
- WH Wright
- Whitefield
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/1953
- Field of study
Fibrin as a component of the tumor stroma: origins and biological significance
- Author
- A Cattan
- A Fischer
- A Raz
- A Rosas-Uribe
- A Sobel
- A Talerman
- A Trosseau
- A Vaheri
- AB Kay
- AE Postlethwaite
- AJ Osbabr
- AL DeWeck
- AL Frank
- AM Bitzer
- B Gerdin
- B Wiman
- BS Schwartz
- BS Schwartz
- BT Atherton
- CL Geczy
- CL Gezy
- CW Francis
- D Gitlin
- D Green
- D Green
- D Marrack
- DA Willoughby
- DF Mosher
- DL Richardson
- DR Senger
- EC Chew
- ED Day
- ED Holyoke
- EF Plow
- EW Davie
- F Doljanski
- F Grinnell
- FA Pitlick
- FR Rickles
- G Girmann
- GA Levy
- GD Resnick
- GF Pineo
- GF Pineo
- GH Lyman
- GH Sack
- GJ Gasic
- GJ Gasic
- GLE Koch
- H Rasche
- H Rothberger
- H Rothberger
- H Stormorken
- HC Hoover
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HF Dvorak
- HI Peterson
- HL Nossel
- HR Gralnick
- HR Gralnick
- HR Gralnick
- IL Spar
- J Calafat
- J Folkman
- J Hermans
- J Khato
- J-C Bystryn
- JE Folk
- JH Cooper
- JJ Ryan
- JK Christman
- JL Ambrus
- JL Maillard
- JM Brown
- JM Gore
- JR Maynard
- JR Maynard
- JR Maynard
- K Aukland
- K Krzystyniak
- K Laki
- K Laki
- K Yamada
- KC Glenn
- KC Robbins
- L Curatolo
- L Svanberg
- LB Chen
- LM Greenbaum
- LM Greenbaum
- LM Greenbaum
- LR Zacharski
- LR Zacharski
- LR Zacharski
- LR Zacharski
- M Belew
- M Belew
- M Colucci
- M Hayashi
- M Kashgarian
- M Kinjo
- M Kinjo
- MB Donati
- MD Pierschbacher
- MM Johnston
- N Sakuragawa
- N Semeraro
- NE Adelman
- NL Harris
- OD Ratnoff
- P Genco
- P Grebow
- P Hilgard
- P Hilgard
- PH Black
- R Bach
- R Hiramoto
- R Hiramoto
- RAQ O'Meara
- RAQ O'Meara
- RB Colvin
- RB Colvin
- RB Colvin
- RE Jordan
- RF Doolittle
- RL Edwards
- RL Edwards
- RL Edwards
- RL Edwards
- RL Edwards
- RL Edwards
- RO Hynes
- RW Colman
- S Lopaciuk
- S Roffman
- S Wood
- SD Peck
- SG Gordon
- SG Gordon
- SG Gordon
- SG Gordon
- SG Gordon
- T Lyberg
- T Wajima
- TP Butler
- TS Zimmerman
- VC Dunkel
- VJ Marder
- VJ Stecher
- WA Boggust
- WH Churchill Jr
- Y Kodama
- Y Nemerson
- Y Tsukamoto
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/1983
- Field of study
Anti-Inflammatory Agents of Animal Origin
- Author
- A Bertelli
- A Geese
- A Janoff
- A Tokuda
- AC Allison
- AE Bogden
- AF Coburn
- AF Coburn
- AF Coburn
- AJ Barret
- AL Borden
- AL Sandberg
- AM Hammeral
- AW Ford-Hutchinson
- AW Ford-Hutchinson
- AW Ford-Hutchinson
- B Beck
- B Hallgren
- British Patent
- BV Robinson
- BV Robinson
- C Laden
- CA Vernon
- CH Gillies
- CH Traeger
- Council of Drugs
- CR Diniz
- CW Fiebre De
- CW Smith
- D Brackertz
- D deWied
- DA Gerber
- DA Gerber
- DA Gerber
- DA Long
- DA Willoughby
- DC Atkinson
- DC Atkinson
- DC Atkinson
- DC Atkinson
- DC Atkinson
- DE Breshears
- DE Epps Van
- DS Nelson
- DT Fearon
- E Auhagen
- E Buchar
- E Garcia-Giralt
- E Kulonen
- E Wood
- EA Martelli
- EF Maderazo
- EJ Field
- EJ Goetzl
- EJ Goetzl
- EJ Goetzl
- EM Glenn
- EM Glenn
- EWB Jeffes
- F Benevuti
- F Cornet
- F Perlik
- F Perlik
- F Ulrich
- FA Anderer
- FA Anderer
- FA Dolbeare
- FA Dolbeare
- FA Kuehl
- FA Kuehl
- Fisons Limited
- FT Moore
- G Bern
- G D’Atri
- G D’Atri
- G Forster
- G Pasquale Di
- G Pasquale Di
- G Pasquale Di
- G Thomas
- G Till
- G Tokaji
- GG Cochrane
- GP Velo
- H Balnec
- H Breithaupt
- H Hayashi
- H Hayashi
- H Horwitz
- H Marberger
- H Raskova
- HE Paulus
- HFL Currey
- HJ MĂĽller-Eberhard
- I Spilberg
- IF Skidmore
- IL Bonta
- IL Bonta
- IR Goldstein
- J Bodman
- J Brock
- J Calderon
- J Calderon
- J Garcia Lerne
- J Garcia Lerne
- J Gool Van
- J Gool Van
- J Mertin
- J Noordhoek
- J Ring
- J Ryzewski
- J Teodorczyk
- J Trapnell
- J Zuckner
- JA Vick
- JC Houck
- JC Houck
- JC Sabo
- JD Fisher
- JD Hallahan
- JE Buck
- JE Trapnell
- JF Prudden
- JF Prudden
- JF Prudden
- JF Prudden
- JF Prudden
- JH Brown
- JH Brown
- JHD Millar
- JL Ambrus
- JL Berenberg
- JL Blonstein
- JL Taylor
- JL Turk
- JL Turk
- JM Hanson
- JM McCord
- JM McCord
- JN McArthur
- JP Bolam
- JR Giroud
- JR Walker
- JR Walker
- K Masek
- K Matsuba
- K Nagai
- K Nagai
- K Tikal
- K Udaka
- K Udaka
- KF Swingle
- KR Bailey
- L Grant
- LS Cushing
- M Hayashi
- M Kamimura
- M Krsiak
- M Manca
- M Rosa Di
- ME Rosenthale
- MEJ Billingham
- MEJ Billingham
- MEJ Billingham
- MEJ Billingham
- MEJ Billingham
- MEJ Billingham
- MEJ Billingham
- MJH Smith
- MJH Smith
- MJH Smith
- MJH Smith
- MJH Smith
- N Pacini
- NR Bachur
- OH Ganley
- OH Ganley
- P Gomarasca
- P Gomarasca
- P Görög
- P Haux
- P Stastny
- PA Ward
- PA Ward
- PA Ward
- PA Ward
- PA Ward
- PA Ward
- PA Ward
- PJ Lachmann
- PM Bazerque
- PNC Elliott
- PNC Elliott
- PS Boyne
- R Hirschelmann
- R Marcy
- R Marcy
- R Paoletti
- R Snyderman
- R Zanasi
- RA Shipolini
- RA Shipolini
- RB Capstick
- RB Soriano
- RB Zurier
- RB Zurier
- RD Nelson
- RD Sofia
- RE Rocklin
- RE Rocklin
- RG Burford
- RH Davis
- RH Davis
- RH Persellin
- RJ Carrico
- RJ Perper
- RL Aspinall
- RL Aspinall
- RS Pinals
- S Boyden
- S Carson
- S Cerutti
- S Garattini
- S Goldstein
- S Ruddy
- SM Wahl
- SR Cooperband
- SR Waldman
- T Kambara
- T Mann
- TG Highton
- TH Rindani
- TR Maxson
- TY Shen
- United States Adopted Names Council
- V Prelog
- VW Stuyvesant
- W Huber
- W Huber
- W Hughes
- W Vogt
- WB Rawls
- WE Decker
- WG Spector
- WG Spector
- WS Livingston
- WS Livingston
- Y Mizushima
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/1979
- Field of study
Recombinant proteins and genomics in cancer therapy
- Author
- A Alizadeh
- A Ganser
- A Gray
- A Kalinkowich
- A Minty
- A Oehm
- A Pluckthun
- A Porgador
- A Singh
- AA Alizadeh
- AA Skolnick
- AA Tevelde
- AC Morgan
- AD Whetton
- ADK Hill
- Aggarwal BB. Tumour necrosis factors receptor associated signalling molecules and their role in activation of apoptosis
- AI Su
- AJ Jacobs
- AL Gurney
- AL Shaffer
- B Klein
- B Mosley
- BB Aggarwal
- BB Aggarwal
- BB Aggarwal
- BC Trauth
- BD Clark
- BH Petersen
- BJA Furr
- BM Curtis
- C Godon
- C Milstein
- C Ross
- C Upton
- C-H Heldin
- CA Dinarello
- CA Dinarello
- CA Smith
- CB Seigall
- CB Siegall
- CB Siegall
- CB Siegall
- CC Park
- CF Chong
- characterization of interleukin-19 (IL-19) a novel homologue of human interleukin-10 (IL-10)
- CJ Sanderson
- CM Gorman
- CM Smith
- Cruikshank WW
- CS Hill
- D Cosman
- D Gospodarowicz
- D Lienard
- D Novick
- D Novick
- D Pardoll
- D Pennica
- D Slamon
- DA Sceinberg
- DA Vallera
- DC Young
- DE Williams
- DE Williams
- DF Bajorin
- DJ Fitzgerald
- DJ Fitzgerald
- E Lalli
- E Niskanen
- E Rinderknecht
- E Zwick
- EH Kaplan
- EL Sievers
- EM Hersch
- ES Kawasaki
- ES Vitetta
- ES Vitetta
- F Brown
- F Xu
- FA Fletcher
- factor-alpha-Pseudomonas exotoxin fusion protein
- FM Uckun
- FM Uckun
- G Dranoff
- G Scambia
- G Sherlock
- G Trinchieri
- G Winter
- G Zurawski
- GA Koppel
- GA Pietersz
- GA Truitt
- GC Sen
- GD Lewis
- GE Nedwin
- GE Nedwin
- GE Peoples
- GE Plautz
- GG Wong
- GH Lorberboum
- GL Sica
- GS Feng
- GT Williams
- H Blumberg
- H Dorai
- H Li
- H Strander
- H Strander
- H Suzuki
- H Tanaka
- H Wang
- HA Coller
- HB Lowman
- HD Campbell
- HE Broxmeyer
- HF Stills
- I Baltathakis
- I Hellstrom
- I Mori
- I Pastan
- I Pastan
- International Human Genome Sequence Consortium
- J Baselga
- J Crawford
- J Gabrilove
- J Heller
- J Markussen
- J Nemunaitis
- J Parrish-Novak
- J Tiesman
- J Tong
- J Weber
- J Yu
- JB Welsh
- JB Welsh
- JC Edman
- JC Jurcic
- JC Renauld
- JC Renauld
- JD Griffin
- JE Karp
- JE Sims
- JG Giri
- JG Jurcic
- JJ Mule
- JK Batra
- JL Ambrus
- JM Claverie
- JN Ihle
- JR Downing
- JR Quesada
- JU Gutterman
- JU Gutterman
- JU Gutterman
- JW Eschbach
- JW Park
- K Arai
- K Cantell
- K Fujiwara
- K Jacobs
- K Leitzel
- K Motoyshi
- K Nakanishi
- K Nakanishi
- K Nelms
- K Obreg
- K Peters
- K Polyak
- K Sasaki
- K Takatsu
- KH Fantes
- KH Grabstein
- KW Moore
- KY Kreeger
- L Coussens
- L Miller
- L Petch
- LA Tartaglia
- LB Lachman
- LD Apelgren
- LE Spitler
- LM Hinman
- LM Souza
- LT Goodnough
- M Katoh
- M Nagao
- M Narazaki
- M Shoyab
- M Talpaz
- M Talpaz
- M Yan
- M Yan
- M Yanuck
- M Yin
- MA Ghetie
- MH Tao
- MH Xie
- MJ Layton
- MJ Lord
- MJ Marton
- MK Spriggs
- ML Grossbard
- ML Heaney
- MP Colombo
- MP Colombo
- MT Lotze
- MT Lotze
- N Arai
- N Gunther
- N Itoh
- N Malik
- N Mukaida
- N Stebbing
- N Zhu
- NM Gough
- NV Katre
- OW Press
- P Bruggen Der
- P Carter
- P Mclaughlin
- P Solal-Celigny
- P Valezuela
- PA Trail
- PH Krammer
- PO Brown
- PS Distefano
- PT Golumbek
- PW Gray
- PW Gray
- R Aebersold
- R Bell
- R Derynck
- R Derynck
- R Fernadez-Borton
- R Fernandez-Botran
- R Fukunaga
- R Goodwin
- R Lewis
- R Lewis
- R Schiro
- R Wetzel
- RA Heller
- RA Hitzeman
- RD Baynes
- RF Lodato
- RF Meredith
- RF Meredith
- RG Fenton
- RG Goodwin
- RG Rosenblum
- RJ Fulton
- RJ Kreitman
- RJ Kreitman
- RJ Kreitman
- RJ Kreitman
- RJ Lipshutz
- RM Conry
- RM Conry
- RV Smalley
- RVJ Chari
- RW Kozak
- S Akira
- S Chaffee
- S Kaptain
- S Nagata
- S Ostrand-Rosenberg
- S Pestka
- S Pestka
- S Pestka
- S Ramakrishnam
- S Samakrishnan
- S Sharma
- S Takaki
- S Talapatra
- S Ushio
- S Vadhan-Raj
- S Vadhan-Raj
- S Vadhan-Raj
- SA Rosenberg
- SA Rosenberg
- SA Rosenberg
- SA Rosenberg
- SE Cwirla
- SK Ahuja
- SR Paul
- SV Kotenko
- T Andus
- T Clackson
- T Gatanaga
- T Hirano
- T Hoshino
- T Ideker
- T Nakajima
- T Nakamura
- T Suda
- T Tanaguchi
- T Waldmann
- TA Fehniger
- TA Waldmann
- TB Strom
- The International Chronic Granulomatous Disease Comparative Study Group
- TR Golub
- TW Griffin
- U Brinkmann
- U Brinkmann
- U Gubler
- U Scherf
- V Trillet-Lenoir
- VA Luckow
- VA Luckow
- VA Spencer
- VE Velculescu
- VK Chaudhary
- VK Chaudhary
- VS Lim
- W Debinski
- W Xu
- WA Hall
- WC Koff
- WH Daughaday
- WJ Leonard
- WP Arend
- XV Ostade
- XX Du
- Y Furukawa
- Y Furutani
- Y Jinno
- YC Yang
- Z Estrov
- ZC Han
- Publication venue
- 'Springer Science and Business Media LLC'
- Publication date
- 01/01/2003
- Field of study