Table 1.

Inclusion and exclusion criteria.

Inclusion	Exclusion
English, full text	Other forms of orthosis (e.g., Halo, SOMI, soft collar) in isolation
Adults (18 years and above)
Reporting on complications of orthosis related to prolonged use of a rigid collar, where prolonged is defined as wear on at least two consecutive days	Animal studies
	Cadaveric studies
	Children and youths (up to and including 17 years)
	Where the primary focus is acute care with no follow-up
	Editorials, letters, replies