First quality score for referral letters in gastroenterology—a validation study

Por Eskeland, Sigrun Losada, Brunborg, Cathrine, Seip, Birgitte, Wiencke, Kristine, Hovde, Øistein, Owen, Tanja, Skogestad, Erik, Huppertz-Hauss, Gert, Halvorsen, Fred-Arne, Garborg, Kjetil, Aabakken, Lars, de Lange, Thomas
Publicado no BMJ Open (2016)