PRACE DOKTORSKIE - SZWECJA 552,110 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) : [akademisk avh. ] / by Jan Willem C. van Doom ; from the Institute for Surgical Disciplines, Department of Orthopaedics, Sahlgrenska University Hospital, Goteborg University. - Goteborg : University, 1995. - [2], 64 s. : il., wykr. ; 24 cm ISBN 91-628-1503-2