Chlorpromazine equivalent key from Davis 1974 dataSource:
A list of antipsychotics and their chlorpromazine equivalent doses, generated from the following file included with the package: system.file("extdata", "davis1974.csv", package="chlorpromazineR").
A named list of 3 named lists (1 for each route) and each sub-list contains the conversion factors for each antipsychotic. The 3 top-level lists are named `oral`, `sai`, and `lai` (route), and the lists they contain have names corresponding to the antipsychotic, e.g. `olanzapine`.