552,110 VAN DOORN JAN WILLEM C. Low back disability among self-employed dentists, veterinarians, physicians and physical therapists in the Netherland : a retrospective study over a 13-year period (N=l, 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, Göteborg University. - Göteborg : University, 1995. - [2], 64 s. : il., wykr. ; 24 cm ISBN 91-628-1503-2