Berrin Gündüz, Belgin Erhan, Merih Sarıdoğan, Nurgül Elbaşı, and Huri Özdoğan, “Postpartum Spinal Osteoporosis: An Unusual Cause of Low Back Pain”, Archives of Rheumatology, vol. 25, no. 1, pp. 047–049, Jan. 2010.