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Table 2 Quality assessment of included cohort studies

From: Percutaneous nephrolithotomy versus flexible ureteroscopic lithotripsy in the treatment of upper urinary tract stones: a meta-analysis comparing clinical efficacy and safety

Source Selection     Comparability Outcome    Scores
Author, year Representativeness of the exposed cohort Selection of the non exposed cohort Ascertainment of exposure Demonstration that outcome was not present at start of study select the most important factora Assessment of outcome Follow-up long enough Adequacy of follow up of cohorts  
Aboutaleb,2012 [9] 7
Armagan,2015 [10] 6
Bozkur,2011 [11] 9
Chung,2008 [12] 7
Ferroud,2011 [13] 7
Hu, 2016 [15] 9
Kirac,2013 [16] 9
Kruck,2013 [17] 7
Ozgor,2016 [19] 7
Ozgor, 2018 [20] 7
Pan, 2013 [21] 7
Sabnis,2012 [22] 7
Schoenthaler,2015 [24] 8
Wilhelm,2015 [25] 6
Zhang,2014 [26] 6
  1. aA maximum of two stars can be awarded for select the most important factor or additional factor