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Preferred reporting items for systematic reveiw and meta-analysis protocols (PRISMA-P) 2015 statement
Moher, D., Shamseer, L., Clarke, M., Ghersi, D., Liberati, A., Petticrew, M., Shekelle, P., Stewart, L., PRISMA-P Group, U., & Lohr, K. (2015). Preferred reporting items for systematic reveiw and meta-analysis protocols (PRISMA-P) 2015 statement. Systematic Reviews, 4(1).