Sundberg, Martin, Henrik Düppe, Per Gárdsell, Olof Johnell, Ewald Ornstein, and Ingemar Sernbo. 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):456-60. https://doi.org/10.3109/17453679708996262.