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BIERING-SØRENSEN, FIN MD, PhD; THOMSEN, CARSTEN MD
From the Laboratory for Back Research, Department of Internal Medicine TTA (Rheumatology), Rigshospitalet, University of Copenhagen; the Population Studies in Glostrup, Section of Prospective Medicine, Department of Internal Medicine C, Glostrup Hospital, University of Copenhagen; and Department of Biostatistics, Institute of Medical Genetics, University of Copenhagen, Denmark