Autor:	Johnson, Ian S., St. George, David, Aus, Christine, Foster, Susan, Lee, Kelley, Shongwe, Stephen, Yakubu, Amadou, Fischbacher, Colin, Gboria, Magnus, Malle, Daouda, Siddiqi, Ahson, Howell, Jack
Zdroj:	BMJ: British Medical Journal, 1993 Sep 01. 307(6904), 624-625.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/29720962 Zobrazit plný text záznamu