Acknowledgements We thank Dr. Karmakar (Research Fellow— University of Aberdeen) for sending out the questionnaires and collating the responses. We thank Lindsey Grant for performing the independent data entry cross-check. A special gratitude goes to all the participants whose excellent cooperation over the years made this study successful. Funding The initial phase of this study (up to 3-year follow-up) was funded by the Henry Smith Charity. Dr. Karmakar was funded by IUGA Clinical Fellowship Grant 2014.Peer reviewedPostprin
