PMID 25424450. ↑ Vlaeyen, E; Coussement, J; Leysens, G; Van der Elst, E; Delbaere, K; Cambier, D; Denhaerynck, K; Goemaere, S; Wertelaers, A; Dobbels, F; Dejaeger, E; Milisen, K; Center of Expertise for Fall and Fracture Prevention, Flanders (February 2015).