Autor:	Leung, Wai-Ching, Duffield, K., Josen, P. K., Low, E., Teare, K., Wray, E., Churchill, Dick, Allen, Jane, Pringle, Mike, Hippisley-Cox, Julia, Ebdon, Dave, Macpherson, Marion, Bradley, Sue, McPherson, Ann, Macfarlane, Aidan, Foran, Terri
Zdroj:	BMJ: British Medical Journal, 2001 Feb 01. 322(7282), 362-364.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/25466161 Zobrazit plný text záznamu