Das, Mousumi, et al. “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, https://nepjol.info/index.php/AJMS/article/view/11853.