WHOUMC(World Health OrganizationUppsala Monitoring Center) 기준에 따라 '가능성 없음' 및 '분류 불가'로 평가된 사례는 제외되었다.
The cases assessed as ‘unlikely’ and ‘unclassifiable’ based on World Health OrganizationUppsala Monitoring Center(WHOUMC) criteria were excluded.