Hasibuan, Anshari Saifuddin, Alvina Widhani, Sukamto Koesnoe, Suzy Maria, Eka Ginanjar, and Sally Aman Nasution. “Benefit of Influenza Vaccination in Patients With Cardiovascular Disease”. Acta Medica Indonesiana 57, no. 4 (December 23, 2025): 552. Accessed December 23, 2025. http://www.actamedindones.org/index.php/ijim/article/view/3230.