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Mahajan, Raman, Sakib Burza, Lex M. Bouter, Klaas Sijtsma, André Knottnerus, Jos Kleijnen, Peter Van Dael, ja Maurice P. Zeegers. "Standardized Protocol Items Recommendations for Observational Studies (SPIROS) for Observational Study Protocol Reporting Guidelines: Protocol for a Delphi Study." JMIR Res Protoc 2020.

Mahajan, Raman, et al. "Standardized Protocol Items Recommendations for Observational Studies (SPIROS) for Observational Study Protocol Reporting Guidelines: Protocol for a Delphi Study." JMIR Res Protoc 2020.