Elizabeth G Raymond , Pai Lien Chen , Bosny Pierre-Louis , Joanne Luoto , Kurt T Barnhart , Lynn Bradley , Mitchell D Creinin , Alfred Poindexter , Livia Wan , Mark Martens , Robert Schenken , Cate F Nicholas and Richard Blackwell
BMC Medical Research Methodology 2004, 4:23doi:10.1186/1471-2288-4-23