“…Ten reviews reported identification of the disconfirming case (Paterson et al, 1998;Paterson et al, 1999;Thomas et al, 2003;Greenhalgh & Peacock, 2005;Dixon-Woods et al, 2006b;Sandelowski et al, 2007;Voils et al, 2008;O'Connell & Downe, 2009;Wong et al, 2010). Sixteen additional items discussed methodological considerations (Noblit & Hare, 1988;Jensen & Allen, 1996;Macintyre & Petticrew, 2000;Author, 2001;Barroso & Sandelowski, 2003;Jones, 2004;Lloyd Jones, 2004;Pawson et al, 2004;Walker & Avant, 2005;Dixon Woods et al, 2006a;May, 2006;Petticrew & Roberts, 2006;Downe, 2007;Weed, 2007;Downe, 2008;Noyes et al, 2008). A process of "snowballing" was used to follow up appropriate references (Papaioannou et al, 2010).…”