Handgrip weakness and mortality risk in COPD: a multicentre analysis. Issue 1 (29th October 2015) - Burtin, Chris; ter Riet, Gerben; Puhan, Milo A; Waschki, Benjamin; Garcia-Aymerich, Judith; Pinto-Plata, Victor; Celli, Bartolome; Watz, Henrik; Spruit, Martijn A