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. 2018 Feb 28;7:246. [Version 1] doi: 10.12688/f1000research.14026.1

Table 2. Methodological quality of the study based on NOS Scale.

Study Selection
(Max ****)		 Comparability
(Max **)		 Outcome
(Max ***)		 Total
Score
Representativeness
of exposed cohort		 Selection
of exposed
cohort		 Ascertainment
of exposure		 No outcome
of interest at
start 		Comparability of
cohorts on the basis
of design of analysis		 Assessment
of outcome		 Was follow-up
long enough
for outcomes
to occur		 Adequacy of
follow up of
cohorts
Bello 2017 25 * * * * ** * Not clear Not clear 7
Choueiri 2009 5 * * * * * * * * 9
Glass 2003 9 * * * * ** * Not clear Not clear 7
Hong 2012 10 * * * * ** * * * 9
Hussain 2006 11 * * * * ** * * * 9
Kadono 2015 4 * * * * ** * * * 9
Kim 2015 18 * * * * ** * * * 9
Kimura 2014 24 * * * * * * * * 8
Koo 2014 17 * * * * ** * * * 9
Kwak 2002 * * * * ** * * * 9
Miller 1992 19 * * * * * * * * 8
Miyamoto
2012 14 		* * * * ** * * * 9
Nayyar 2010 * * * * ** * * * 9
Park 2009 15 * * * * ** * * * 9
Sasaki 2011 22 * * * * ** * - * 7
Teoh 2017 21 * * * * ** * * * 9
Tomioka 2014 20 * * * * ** * * * 9