Title Page
Contents
Abstract 6
Introduction 8
Materials & Methods 10
Literature search 10
Eligible criteria 10
Exclusion criteria, data extraction and quality assessment 11
Statistical analysis 11
Results 14
Literature search and study selection 14
Study characteristics and quality 16
Quantitative data synthesis 18
Subgroup analyses and meta-regression 20
Discussion 23
References 28
Supplementary Information 35
초록 46