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. 2014 Apr 8;9(4):e94084. doi: 10.1371/journal.pone.0094084

Table 2. Quality assessment of included studies based on Newcastle-Ottawa Scale.

Author Selection Comparability Exposure
Polidori 3 2 3
Carantoni 4 2 3
Cervellati 3 0 3
Cascalheira 3 2 3
Can 4 1 3
Kim 3 2 3
Cankurtaran 3 2 2
Iuliano 4 2 3
Zafrilla 3 2 2
Foy 4 2 3
Maesaka 3 2 3