TY - JOUR T1 - National Sports Centre--Papendal, The Netherlands. JF - British Journal of Sports Medicine JO - Br J Sports Med SP - 7 LP - 9 DO - 10.1136/bjsm.24.1.7 VL - 24 IS - 1 AU - P A van Beek Y1 - 1990/03/01 UR - http://bjsm.bmj.com/content/24/1/7.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -