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机构:
Walter Sisulu Univ, Fac Hlth Sci, Dept Med, Mthatha, South Africa
Frere Hosp, Dept Internal Med, East London, Eastern Cape, South Africa
Cecilia Makiwane Hosp, Dept Internal Med, East London, Eastern Cape, South Africa Johns Hopkins Univ, Sch Med, Dept Emergency Med, Baltimore, MD 21218 USA