1. CDC. International Classification of Diseases, Ninth Revision, Clinical Modification (ICD-9-CM) [Internet]. Available from:
https://www.cdc.gov/nchs/icd/icd9cm.htm
.
2. CDC. International Classification of Diseases, Tenth Revision, Clinical Modification (ICD-10-CM) [Internet]. Available from:
https://www.cdc.gov/nchs/icd/icd10cm.htm
.
3. International Health Terminology Standards Development Organization. SNOMED CT [Internet]. Available from:
https://www.snomed.org/
.
4. LOINC from Regenstrief [Internet]. [cited 2017 May 8]. Available from:
https://loinc.org/
.
5. Liu S, Wei M, Moore R, Ganesan V, Nelson S. RxNorm: prescription for electronic drug information exchange. IT Prof. 2005;7(5):17–23.