Sundberg, M., Düppe, H., Gárdsell, P., Johnell, O., Ornstein, E., & Sernbo, I. (1997). Bone mineral density in adolescents: Higher values in a rural area—a population-based study of 246 subjects in southern Sweden. Acta Orthopaedica, 68(5), 456–460. https://doi.org/10.3109/17453679708996262