N. Afridi, U. Masood, S. Balooch, S. Khan, and S. Khan, “COMPARISON OF EFFICACY OF ORAL PROGESTERONE AND MICRONIZED PROGESTERONE PESSARY IN REDUCTION OF INCIDENCE OF SPONTANEOUS PRETERM BIRTHS”, J Ayub Med Coll Abbottabad, vol. 31, no. 2, pp. 248–251, Mar. 2019.