Cha, Jin Gyong , Pyongyang University of Medical Sciences Cha, Yong Chol, Phyongnam Koryo Medicine Hospital Chae, Kwang-Hyon, Pyongyang General Hospital, Pyongyang, Democratic People’s Republic of Korea. Chae, Myong Chan, Nampho General Hospital, Nampho, Democratic People’s Republic of Korea. Challab, Maha.F. Chaudhary, Sehar , The University of Lahore, Gujrat Campus Chetheer, Zainab Sadik Choe, Chang Hyon, Hospital of Pyongyang University of Medical Sciences Choe, Hye-Yong , Pyongyang University of Medical Sciences Choe, Hyeyong , Pyongyang University of Medical Sciences Choe, Hyok, Pyongyang University of Medical Sciences Choe, Il, Koryo Medicine General Hospital, Pyongyang, Democratic People’s Republic of Korea. Choe, Jong-Hwa, Department of Gastroenterology, Hospital of Pyongyang University of Medical Science, Democratic People’s Republic of Korea. Choe, Ju-Song , Department of Dermatology, Faculty of clinical medicine, Pyongyang University of Medical sciences, Pyongyang, Democratic People’s Republic of Korea.