`all_data_long_v3.csv' - data in long format where each row represents an observation/infant from the studies; repeated measures within studies
`all_data_v3.csv' - the exported data from Covidence in "short" format but really long format stretched to be short; this is modified to be usable in the main results script
`sampling_methods_v3.csv' - dataframe with the sampling method used for each study