aDepartment of Pediatricsm, School of Medicine, Ewha Womans University, Seoul, Republic of Korea; bDepartment of Preventive Medicine, School of Medicne, Ewha Womans University, Seoul, Republic of Korea
Federal State Budgetary Educational Institution of Higher Professional Education Kuban State Medical University of Ministry of Health of the Russian Federation, Krasnodar, Russia
aUniversity of Port Harcourt Teaching Hospital, Port Harcourt, Rivers State, Nigeria; bCollege of Health Science, University of Port Harcourt, Port Harcourt, Rivers State, Nigeria