olde Hartman Tim C, van Ravesteijn Hiske, Lucassen Peter, van Boven Kees, van Weel-Baumgarten Evelyn, van Weel Chris
Department of Primary and Community Care, Radboud University Nijmegen Medical Centre, The Netherlands.
Br J Gen Pract. 2011 Dec;61(593):e839-41. doi: 10.3399/bjgp11x613269.