Relationship of vitamin D, fibrinogen and their ratio with acute coronary syndrome: A comparative analysis of unstable angina, NSTEMI, and STEMI. - Ullah, Himayat; Huma, Sarwat; Ashraf, Muhammad; Tahir, Nafisa; Yasin, Ghulam; Yunus, Mohammed; Shabana, Hossam; Muharram, Mohamed Ahmed; Shalaby, Abdulrahman H.; Ali, Ahmed Ali Hassan; Mahmoud, Mohamed Elwan Mohamed; Ibrahim, Ahmed Mahrous Ahmed; et al. (PLoS ONE, 2025)