Text and Data Mining valid from 2016-02-04
Received: 20 April 2015
Revised: 10 November 2015
Accepted: 7 December 2015
First Online: 4 February 2016
: JWLC is supported by a Veni-grant (91614078) of the Netherlands Organisation for Health Research and Development (ZonMw). LvD received unrestricted grants from Astra Zeneca, BMS and Pfizer for research not related to this study. MV, MAM, ME and LSvdH declare no potential conflicts of interest.