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This is an update request for the document Comprehensive characterisation of pulmonary and serum surfactant protein D in COPD by Carla Winkler, Elena N Atochina-Vasserman, Olaf Holz, Michael F Beers, Veit J Erpenbeck, Norbert Krug, Stefan Roepcke, Gereon Lauer, Martin Elmlinger and Jens M Hohlfeld

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