1 Department of Medical Oncology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands. H.W.G.Derksen-2@umcutrecht.nl.
2 Department of Epidemiology, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands. H.W.G.Derksen-2@umcutrecht.nl.
3 Department of Epidemiology, Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands.
4 Department of Medical Oncology, University Medical Center Utrecht, Utrecht University, Utrecht, Netherlands.