Authors: de Vet HC, de Bie R, van der Heijden GJ, Verhagen A, Sijpkes P, Knipschild PGSource: Physiotherapy.1997;83:284-289DOI: 10.1016/S0031-9406(05)66175-5Language: EnglishAvailability: abstract
Authors: Koes BW, Assendelft WJ, van der Heijden GJ, Bouter LM, Knipschild PGSource: BMJ. 1991 Nov 23;303(6813):1298-303DOI: Not specifiedLanguage: EnglishAvailability: full text
Authors: van der Heijden GJ, Beurskens AJ, Koes BW, Assendelft WJ, de Vet HC, Bouter LMSource: Phys Ther. 1995 Feb;75(2):93-104DOI: Not specifiedLanguage: EnglishAvailability: full text