Autor:	Muir, John, Lancaster, Tim, Fowler, Godfrey, Neil, Andrew, Smith, George Davey, Ebrahim, Shah, Baxter, Tony, Milner, Philip, Nicholl, Jon, Wilson, Keith
Zdroj:	BMJ: British Medical Journal, 1998 Feb . 316(7132), 704-705.
Databáze:	JSTOR Journals
Externí odkaz:	https://www.jstor.org/stable/25178428 Zobrazit plný text záznamu