TY  - RPRT
TI  - Classification of headache disorders.
AU  - Nabih M Ramadan
AU  - Jes Olesen
PY  - 2006
DO  - 10.1055/s-2006-939915
UR  - https://pubmed.ncbi.nlm.nih.gov/16628525/
ID  - 16628525
ER  -