Son, Jong A , Pyongyang University of Medical Sciences, Pyongyang, Democratic People’s Republic of Korea. Son, Man Bok , Department of Dental Caries and Oral Medicine Research, Faculty of Dentistry, Pyongyang University of Medical Sciences, Pyongyang, Democratic People’s Republic of Korea. Son, Man-Bok , Department of Dental Caries and Oral Medicine Research, Pyongyang University of Medical Sciences, Pyongyang, Democratic People’s Republic of Korea. Song, Song-Il , Pyongyang University of Medical Sciences, Ryonhwa-dong, Central District, Pyongyang, Democratic People’s Republic of Korea. Song, Yong Su , Institute for Infection Control, Faculty of Hygiene, Pyongyang University of Medical Sciences, Democratic People’s Republic of Korea. Song, Yong Su, Scientific Research Department, Pyongyang University of Medical Sciences, Democratic People’s Republic of Korea. Suhail, Ammar A., Medical Laboratory Techniques, Al-Zahrawi University College, Karbala, Iraq