Table 1. Study characterisitcs.

Author	Year	Country	Study type	Publication type	No. of cases	Enteroscope used in study	Peroral cases	Peranal cases
Honda et al(9)	2006	Japan	Retrospective	fulltext	13	DBE	13	0
Heine et al(10)	2006	Netherlands	Retrospective	fulltext	275	DBE	NA	NA
Mensink et al(11)	2007	Netherlands	Prospective	fulltext	2362	DBE	1207	412
Kopáčová et al(12)	2007	Czech	Prospective	fulltext	35	DBE	35	0
Gerson et al(13)	2009	USA	Retrospective	fulltext	2413	DBE	1691	722
Aktas et al(14)	2009	Netherlands	Prospective	fulltext	135	DBE	135	0
Pata et al(15)	2010	Turkey	Retrospective	fulltext	56	DBE	48	8
Aktas et al(7)	2010	Netherlands	Prospective	fulltext	166	SBE	44	61
Nishimura et al(16)	2010	Japan	Retrospective	fulltext	92	DBE	25	10
Zepeda-Gómez et al(17)	2011	Mexico	Prospective	fulltext	92	DBE	92	0
Möschler et al(6)	2011	Germany	Prospective	fulltext	2245	DBE	1052	277
Teshima et al(18)	2012	Netherlands	Prospective	fulltext	32	SE	32	0
Shibuya et al(19)	2012	Japan	Retrospective	fulltext	202	DBE	202	0
Itaba et al(20)	2013	Japan	Prospective	fulltext	44	DBE	44	0
Feng et al(21)	2014	China	Prospective	fulltext	20	DBE	12	8
Nakayama et al(22)	2014	Japan	Retrospective	fulltext	538	DBE	295	243
Tsujikawa et al(23)	2015	Japan	Retrospective	fulltext	84	SBE	84	0
Kopáčová et al(24)	2016	Czech	Prospective	fulltext	117	DBE	117	0
Matsushita et al(25)	2016	Japan	Retrospective	fulltext	96	DBE	96	0
Ivano et al(26)	2017	Brozil	Retrospective	fulltext	65	DBE	NA	NA
Hagiwara et al(27)	2019	Japan	Prospective	fulltext	96	DBE and SBE	20	76
Goenka et al(28)	2020	India	Retrospective	fulltext	180	SBE	114	66
Noujaim et al(29)	2020	USA	Retrospective	fulltext	1787	DBE, SBE and SE	1514	270