Chrismas Gideon Bangun Department of Anesthesiology and Intensive Care, Faculty of Medicine Universitas Sumatera Utara/Haji Adam Malik General Hospital, Medan Indonesia
Tasrif Hamdi Department of Anesthesiology and Intensive Care, Faculty of Medicine Universitas Sumatera Utara/Haji Adam Malik General Hospital, Medan Indonesia
Juliandi Harahap Department of Community Medicine, Faculty of Medicine, Universitas Sumatera Utara Indonesia