Attiqa Khalid, Maria Gill, Sadia Nazir, Nazia Farooq, Faiqa Jabeen Naeem, Zaima Ali, Uzma Zafar, Hamid Javaid Qureshi. “Serum Estradiol Levels During First Trimester of Pregnancy”. Pakistan Journal of Medical & Health Sciences, vol. 16, no. 07, July 2022, p. 108, doi:10.53350/pjmhs22167108.