K. L. Koay, M. N. Ong, Z. Y. Tok, N. B. Ahmad Jafri, and R. R. Thangaratnam, “Subhepatic perforated subhepatic appendicitis versus acute cholecystitis: a diagnostic dilemma”, Int Surg J, vol. 9, no. 11, pp. 1881–1883, Oct. 2022.