Is orbital floor a reliable and useful surgical landmark in endoscopic endonasal surgery?: a systematic review

Table 2 Ethnicity and type of study conducted

Study	Year	Type	Region	Ethnic	No. of Subject
Study	Year	Type	Region	Ethnic	Total	Right	Left
Casiano et al. [12]^a	2001	Cadaver	USA	Caucasian	18	–	–
Harvey et al. [13]	2010	CT PNS^b	USA & Australia	Caucasian	300	150	150
Lee et al. [15]	2012	CT PNS^b	Canada	Caucasian	100	50	50
Wuttiwongsanon et al. [14]	2015	CT PNS^b	Thailand	Asian	300	150	150
Lee [19]	2017	CT PNS^b	Korea	Asian	230	115	115
Total					948

ISSN: 1472-6815