KHAN, F. K. et al. Preterm Birth Frequency among Women with Risk Factors Presenting at 28–34 Weeks and Receiving Oral Micronized Progesterone: A Prospective Single-Arm Study: Preterm Birth Frequency among Women Receiving Oral Micronized Progesterone. Pakistan BioMedical Journal, v. 9, n. 9, p. 29–34, 30 Sep.2026.