Mannan, A. A., S. A. Soomro, A. Kumari, and F. A. R. Memon. “Umbilical Bleeding During Menstruation in Status Post Laparoscopic Cholecystectomy of unknown/Ambiguous Aetiology”. International Surgery Journal, vol. 9, no. 6, May 2022, pp. 1250-3, doi:10.18203/2349-2902.isj20221419.