Article History
Received: 29 October 2015
Revised: 3 June 2016
Accepted: 4 July 2016
First Online: 10 August 2016
Competing interests
: PV and GW received funding from the Swiss National Science Foundation (Bern, Switzerland); GlaxoSmithKline (Philadelphia, PA, USA) and the Faculty of Biology and Medicine of Lausanne (Lausanne, Switzerland) to conduct the CoLaus study. PMV declares no conflict of interest.