Kruis Annemarije L, van Schayck Onno C P, in't Veen Johannes C C M, van der Molen Thys, Chavannes Niels H
Department of Public Health and Primary Care, Leiden University Medical Center, PO Box 9600, 2300 RC Leiden, Netherlands.
Department of General Practice, University of Maastricht, Research Institute CAPHRI, Maastricht, Netherlands.
Lancet Respir Med. 2013 Nov;1(9):670-2. doi: 10.1016/S2213-2600(13)70212-1. Epub 2013 Nov 4.