David Atkins
, Martin Eccles
, Signe Flottorp
, Gordon H Guyatt
, David Henry
, Suzanne Hill
, Alessandro Liberati
, Dianne O'Connell
, Andrew D Oxman
, Bob Phillips
, Holger Schünemann
, Tessa Tan-Torres Edejer
, Gunn E Vist
, John W Williams Jr
and The GRADE Working Group 
BMC Health Services Research 2004,
4:38doi:10.1186/1472-6963-4-38