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["Table 2. Quality of retrospective studies, as assessed on the Newcastle-Ottawa Quality Assessment Scale (NOS)."]
["Study","Selection",{"$nulls":3},"Comparability","Outcomes",null,null,"Total score"]
[null,"Definition of exposed cohort","Selecting non-exposed cohort","Ascertainment of exposure","Outcomes was not present at start","Comparing cohorts of design and analysis","Assess outcome","Follow-up time (>3 years)","Adequacy of follow-up of cohorts"]
["McEachron (2021)","★","★","★",null,"★★","★","★",null,7]
["Montes de Oca (2021)","★","★","★",null,"★★","★",null,null,6]
["Bogani (2020)","★","★","★",null,"★★","★",null,"★",7]
["Huang (2020)","★","★","★",null,"★★","★","★","★",8]
["Ko (2020)","★","★","★",null,"★★","★","★",null,7]
["Lee (2020)","★","★","★",null,"★★","★","★",null,7]
["van Weelden (2020)","★","★","★",null,"★★","★",null,null,6]
["Verrengia (2020)","★","★","★",null,"★","★",null,"★",6]
["Kahramanoglu (2019)","★","★","★",null,"★","★","★",null,6]
["Kidd (2019)","★","★","★",null,"★★","★","★",null,7]
["Syeda (2019)","★","★","★",null,"★★","★","★",null,7]
["Albuquerque (2018)","★","★","★",null,"★","★",null,null,5]
["Wang (2018)","★","★","★",null,"★","★",null,null,5]
["Binder (2017)","★","★","★",null,"★★","★","★","★",8]
["Lester-Coll (2016)","★","★","★",null,"★★","★","★",null,7]
["Lin (2016)","★","★","★",null,"★","★",null,null,5]
["Mahdi (2016)","★","★","★",null,"★","★",null,null,5]
["Signorelli (2015)","★","★","★",null,"★","★","★",null,6]
["Kuku (2013)","★","★","★",null,"★","★","★","★",7]
["Secord (2013)","★","★","★",null,"★","★","★",null,6]
["Marchetti (2011)","★","★","★",null,"★","★","★","★",7]
["Havrilesky (2009)","★","★","★",null,"★","★","★",null,6]