Faber, Timor
Been, Jasper V
Reiss, Irwin K
Mackenbach, Johan P
Sheikh, Aziz
Article History
Received: 7 April 2016
Revised: 25 July 2016
Accepted: 2 August 2016
First Online: 17 November 2016
Competing interests
: AS is joint editor-in-chief of <i>npjPCRM</i>. He was not involved in the decision to commission this review and had no role in the handling process or peer review of this work. The remaining authors declare no conflict of interest.