PRACE DOKTORSKIE - SZWECJA 301,078 VAN DOORN JAN WILLEM C. Low back disability among self-employed dentists, veterinarians, physicians and physical therapists in the Netherlands : a retrospective study over a 13-year period (N=1,119) and an early intervention program with 1-year follow-up. (N=134) / Jan Willem C. van Doom ; from the Institute for Surgical Disciplines, Department of Orthopaedics, Sahlgrenska University Hospital, Goteborg University [...]. -Oslo [etc. ] : Acta Orthopaedica Scandinavica, 1995. - [2], 64 s. i wykr. , 24 cm (Acta Orthopaedica Scandinavica, ISSN 0300-8827 , vol. 66, suppl. 263)