Determination of age-associated changes in os calcis ultrasonic indices in elderly women: potential involvement of geriatric hyposomatotropism in bone fragility. - Boonen,S.; Nicholson,P.H.; Lowet,G.; Cheng,X.G.; Verbeke,G.; Lesaffre,E.; Aerssens,J.; Dequeker,J. (Age & Ageing, 1997)