@article{RN150,
   author = {Voss, E. A. and Ma, Q. and Ryan, P. B.},
   title = {The impact of standardizing the definition of visits on the consistency of multi-database observational health research},
   journal = {BMC Med Res Methodol},
   volume = {15},
   pages = {13},
   ISSN = {1471-2288 (Electronic)
1471-2288 (Linking)},
   DOI = {10.1186/s12874-015-0001-6
10.1186/s12874-015-0001-6 [pii]},
   url = {https://www.ncbi.nlm.nih.gov/pubmed/25887092
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4369827/pdf/12874_2015_Article_1.pdf},
   year = {2015},
   type = {Journal Article}
}

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