Liesbeth Borgermans, Geert Goderis, Carine Van Den Broeke, Geert Verbeke, An Carbonez, Anna Ivanova, Chantal Mathieu, Bert Aertgeerts, Jan Heyrman, Richard Grol
BMC Health Serv Res. 2009; 9: 179. Published online 2009 October 7. doi: 10.1186/1472-6963-9-179