TY  - RPRT
TI  - Headache epidemiology: how and why?
AU  - Lars Jacob Stovner
PY  - 2006
DO  - 10.1007/s10194-006-0276-4
UR  - https://pubmed.ncbi.nlm.nih.gov/16575503/
ID  - 16575503
ER  -