drug dose update

[tiozab]

https://ohdsi.github.io/CommonDataModel/drug_dose.html
we used this page as a basis to go about drug dose, but did not get very far because not very accurate / tested.
we have just published a paper about how to estimate dose in OMOP CDM and tested it against WHO DDD in many databases.
https://onlinelibrary.wiley.com/doi/10.1002/pds.5809
@cgreich @catalamarti
Thus, if possible, we would like to update the current github page about dosing calculations accordingly. How to go about it? Can we just send a pull request?

[tiozab]

@clairblacketer I see you are the author of the Rmarkdown

CommonDataModel/rmd/drug_dose.Rmd

Line 4 in 3b84ef6

output: html_document