Autor:	Stansby, G., Ettedgi, S., Hamilton, G., Northeast, Andrew D. R., Wilson, Nicholas M., Burnand, Kevin G., Cheatle, Timothy, Smith, Philip Coleridge
Zdroj:	BMJ: British Medical Journal, 1990 May 01. 300(6733), 1198-1199.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/29707790 Zobrazit plný text záznamu