1. Research Division, Donor Studies DepartmentSanquin Blood Supply Amsterdam The Netherlands
2. Academic Medical Center, Public Health DepartmentUniversity of Amsterdam Amsterdam The Netherlands
3. Blood Bank Division, Medical Services DepartmentSanquin Blood Supply Amsterdam The Netherlands
4. Epidemiology and Biostatistics DepartmentVrije Universiteit Medical Center (VUmc) Amsterdam The Netherlands
5. Faculty of Social Sciences, Sociology DepartmentVrije Universiteit Amsterdam Amsterdam The Netherlands