Study Low number of
patients
(10 or fewer)		 ND examined
by less than
2 methods 		Random
selection of
patients 		Exact post-operative outcomes
were not indicated
for each patient
Morrison et al. [1] - - - -
Chrcanovic et al. [2] - + + +
Kan et al. [3] + - + -
Khajehahmadi et al. [4] - - + +
Ferrigno et al. [6] - - - -
Karlis et al. [7] + + - -
Kan et al. [8] + Not mentioned - -
Peleg et al. [10] - + - -
Del Castillo Pardo et al. [14] + + - -
Proussaefs [15] + + - -
Hashemi [16] - Not mentioned + -
Vasconcelos et al. [17] + Not mentioned + -
Hashemi [18] - + - -
Lorean et al. [19] - - - +
Gasparini et al. [20] - - - -
Barbu et al. [23] + + - +
Dal Ponte et al. [24] + + + -
Suzuki et al. [26] + Not mentioned + -
Proussaefs [27] + + + -

ND = neurosensory disturbances.