Instruction timing expressions references - ppazos/cabolabs-ehrserver GitHub Wiki
http://www.anapsid.org/resources/drugdose.html
http://www.d.umn.edu/medweb/Modules/Prescription/Abbreviations.html
https://en.wikipedia.org/wiki/List_of_medical_abbreviations:_Latin_abbreviations
http://petdiabetes.wikia.com/wiki/Dosage_abbreviation
https://argonaut.healthintersections.com.au/datatypes.html#timing