1. Faculty of Medicine and Health Sciences, Ghent University, Campus UZ Gent, Building K3, 3rd floor, De Pintelaan 185, 9000 Gent, Belgium.
2. Department of Reproductive Health and Research, World Health Organization, Geneva, Switzerland.
3. Department of Health Behavior and Biological Sciences, School of Nursing, University of Michigan, Ann Arbor, United States of America.