Study	Reason for exclusion
Akbar 2015	No control group
Arthurs 2012	No control group
Basseri 2012	No control group
Biasco 2002	No control group
Bopanna 2016	No control group
Brostrom 1986	No control group
Carballal 2014	No control group
Choi 2015	No control group
Eaden 2000	Not designed to assess colonoscopic surveillance
Friedman 2001	No control group
Gonzalez 2016	No control group
Gunther 2011	No control group
Hata 2003	No control group
Hernandez 2013	No control group
Higashi 2011	No control group
Hiroyuki 2014	No control group
Jonsson 1994	No control group
Lindberg 2005	No control group
Lofberg 1990	No control group
Lynch 1993	No control group
Manninen 2013	No control group
Matsuoka 2013	No control group
Monzur 2013	No control group
Mooiweer 2015	No control group
Nugent 1991	No control group
Panara 2016	No control group
Riegler 2003	No control group
Rodino 2011	No control group
Rosenstock 1985	No control group
Rutegard 2016	No control group
Rutter 2006	No control group
Saoula 2013	No control group
Stolwijk 2013	No control group
Velayos 2006	No control group