@misc{indiciae75495a66d357, title = {A simple and valid tool distinguished efficacy from effectiveness studies.}, author = {Gerald Gartlehner and Richard A Hansen and Daniel Nissman and Kathleen N Lohr and Timothy S Carey}, year = {2006}, doi = {10.1016/j.jclinepi.2006.01.011}, url = {https://pubmed.ncbi.nlm.nih.gov/16980143/}, note = {Source identifier: 16980143} }