J. A. van Poortvliet

Influence of Anthropometric Factors and Joint Laxity in the Incidence of Adolescent Back Pain

P. Pynsent, J. Fairbank, J. A. van Poortvliet, 1984, Spine.

Mechanical factors in the incidence of knee pain in adolescents and young adults.

P B Pynsent, H Phillips, P. Pynsent, 1984, The Journal of bone and joint surgery. British volume.