Ahmed, F., S. Yasir, N.- i- kiran Naeem, and A. Amin. “Efficacy of 17 Αlpha Hydroxy Progesterone in Prevention of Preterm Labour in High Risk Patients”. Annals of King Edward Medical University, Vol. 18, no. 2, 1, p. 158, doi:10.21649/akemu.v18i2.394.