Table 1. Summary of sublingual approach.

Authors	Technique	Ports & incision	Type	N	Complications
Witzel et al. (2008)	Sublingual	20 mm at center of floor of mouth, two 3.5 mm at skin	Cadavers, Pigs	2, 10	–
Karakas et al. (2009)	Sublingual (TOPP)	20 mm at lateral floor of mouth	Pigs, Cadavers, Human	10, 10, 2p	1 hypoglossal nerve injury
Karakas et al. (2014)	Sublingual (TOPP)	20 mm at lateral floor of mouth	Human	5p	1 RLN injury, 2 conversion
Woo (2014)	Sublingual	30 mm at center of floor of mouth	Human	1	–

^P, parathyroidectomy.