المؤلفون: O'Brien, P. M. S., Lindsay, Peter, Beveridge, Ranjini, Dawson, Andrew J., Candelier, Claire, Gough, Nigel A., Middlemiss, Charlette, Hibbard, Bryan M.

المصدر: BMJ: British Medical Journal, 1989 Nov . 299(6710), 1280-1281.

URL الوصول: https://www.jstor.org/stable/29706072