Haddad Mehrjerdi,S , , Moazzami,M , and Tara,F . "Effect of physioball selected exercise on low back pain, lumbar lordosis, strength and flexibility in pregnant women", The Iranian Journal of Obstetrics, Gynecology and Infertility, 18, 183, 2016, 20-31. doi: 10.22038/ijogi.2016.6723