Department of Sports and Wellness Clinic;
Jikei University School of Medicine;
Tokyo;
Japan;
Department of Orthopaedic Surgery;
Jikei University School of Medicine;
Tokyo;
Japan;
Graduate School of Humanities and Sciences;
Ochanomizu University;
Tokyo;
Japan;
Bone; Quality; Bone; Mineral; Density; Female; Athletes; Ballet; Dancer;