![Somatic Versus Nonsomatic Shoulder and Back Pain Experience in Middle Age in Relation to Body Build, Physical Fitness, Bone Mineral Content, Gamma-Glutamyltransferase, Occupational Workload, and Psychosocial Factors]()
Somatic Versus Nonsomatic Shoulder and Back Pain Experience in Middle Age in Relation to Body Build, Physical Fitness, Bone Mineral Content, Gamma-Glutamyltransferase, Occupational Workload, and Psychosocial FactorsBERGENUDD, HANS; JOHNELL, OLOF · Spine · 1991