Sections

• Preface
• Acknowledgments
• 1. Background
• 2. Methods
• 3. Results
• 4. Discussion
• References
• Abbreviations
• Appendix A. Literature Search Strategy
• Appendix B. Systematic Reviews
• Appendix C. Primary Studies
• Appendix D. Excluded Studies with Reason for Exclusion
• Appendix E. List of Studies in the Systematic Reviews and Primary Studies
• Appendix F. Risk of Bias and Amstar2 Assessments