Prognostic factors for patellofemoral pain: a multicentre observational analysis
Natalie J Collins, Sita M A Bierma-Zeinstra, Kay M Crossley, Robbart L van Linschoten, Bill Vicenzino, Marienke van Middelkoop
British Journal of Sports Medicine Mar 2013, 47 (4) 227-233; DOI: 10.1136/bjsports-2012-091696