- Correspondence to Almar A L Kok, Epidemiology & Biostatistics, VU University Medical Center, Amsterdam 1081 HV, The Netherlands;
- Received October 12, 2018
- Revised January 15, 2019
- Accepted February 16, 2019
- First published March 19, 2019.
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.