Identifying the PECO: A framework for formulating good questions to explore the association of environmental and other exposures with health outcomes

Rebecca L. Morgan, Paul Whaley, Kristina A. Thayer, Holger J. Schünemann

Environment International. 2018;121:1027-1031. doi: 10.1016/j.envint.2018.07.015

https://www.sciencedirect.com/science/article/pii/S0160412018302046

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