Subclinical thyroid dysfunction and depressive symptoms: protocol for a systematic review and individual participant data meta-analysis of prospective cohort studies by Lamprini Syrogiannouli, Stephan J L Bakker, Rudi G J Westendorp, Luigi Ferrucci, Elisavet Moutzouri, Martin Feller, Drahomir Aujesky, Nicolas Rodondi, Henry Völzke, Hans Grabe, Jacobijn Gussekloo, Matthias Nauck, Cinzia Del Giovane, J Wouter Jukema, Lea Wildisen, Shanthi Beglinger, Anne R Cappola, Bjørn O Åsvold, Graziano Ceresini, Robin Dullaart, Stella Trompet, Robin P Peeters, Stefan Klöppel, Douglas C Bauer

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