RT Journal Article SR Electronic T1 J. G. P. Williams and P. N. Sperryn (Eds) “Sports Medicine” 2nd Ed JF British Journal of Sports Medicine JO Br J Sports Med FD BMJ Publishing Group Ltd and British Association of Sport and Exercise Medicine SP 240 OP 240 DO 10.1136/bjsm.10.4.240 VO 10 IS 4 A1 C. B. Wynn Parry YR 1976 UL http://bjsm.bmj.com/content/10/4/240.abstract AB