Quantitative ultrasound at the phalanges in a cohort of monozygotic twins of different ages

Bone mass regulation; Bone tissue; Hand phalanges; Quantitative ultrasound; Twins; Adolescent; Adult; Aged; Body Height; Body Mass Index; Body Weight; Child; Child, Preschool; Female; Finger Phalanges; Humans; Infant; Male; Middle Aged; Reference Values; Reproducibility of Results; Bone Density; Twins, Monozygotic; Radiology, Nuclear Medicine and Imaging; Medicine (all)