Zinc for the treatment of the common cold: a systematic review and meta-analysis of randomized controlled trials

Online Appendices

Files in this Data Supplement:

• Appendix 1: Search strategy for trials (run as of September 30, 2011)
• Appendix 2: Details of contacting authors
• Appendix 3: Subgroup credibility
• Appendix 4: Risk of bias graph: review authors' judgments about each risk of bias item presented as percentages across all included studies
• Appendix 5: Grade evidence profile
• Appendix 6: Summary of results from subgroup analyses
• Appendix 7: Additional analyses