1. Department of Public Health and Primary Care, Health Campus The Hague, Leiden University Medical Center, The Hague, The Netherlands.
2. Mathematical Institute, Leiden University, Leiden, The Netherlands.
3. Medical Statistics Department of Biomedical Data Science, Leiden University Medical Center, Leiden, The Netherlands.
4. Trial and Data Center, Princess Maxima Center for Pediatric Oncology, Utrecht, The Netherlands.
5. Department of Health Policy and Management, Bloomberg School of Public Health Johns Hopkins University, Baltimore Maryland, USA.
6. Jan van Es Instituut, Ede, The Netherlands.