Table 3

Study classification: Newcastle–Ottawa scale for cohort studies

Article (year)Newcastle–Ottawa Quality Assessment*
Gaita et al (2007)167
McCready et al (2011)196
Yan et al (2013)246
Hayashi et al (2014)237
Contreras-Valdes et al (2015)245
Müssigbrodt et al (2015)255
  • *From 0 to 9 points.