Elwande Hagasaro Zega
(1), Selly Azmeila
(2), Yetty Machrina
(3), Kamal Basri Siregar
(4)
(1)
Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia, Indonesia ,
(2)
Department of Physiology, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia, Indonesia ,
(3)
Department of Physiology, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia, Indonesia ,
(4)
Department of Surgery, Faculty of Medicine, Universitas Sumatera Utara, Medan, Indonesia, Indonesia