Das, M., U. K. Biswas, and A. Kumar. “24 Hours Urinary Hydroxyproline - A Noninvasive, Cost-Effective and Early Biochemical Marker Which May Be Used to Screen the Osteoporotic Lesion in Postmenopausal Women”. Asian Journal of Medical Sciences, vol. 6, no. 4, Jan. 2015, pp. 21-24, doi:10.3126/ajms.v6i4.11853.