Nijsten T, Rolstad T, Feldman SR, Stern RS. Members of the national psoriasis foundation: more extensive disease and better informed about treatment options. Archives of Dermatology 2005;141(1): 19-26, p24 table 3 and text. http://archderm.ama-assn.org/cgi/reprint/141/1/19.pdf
«Against all odds? Improving the understanding of risk reporting». A’Court, Christine; Stevens, Richard; Heneghan, Carl. British Journal of General Practice, Volume 62, Number 596, March 2012, pp. e220-e223(4). doi:10.3399/bjgp12X630223