TY  - RPRT
TI  - Headache research methodology.
AU  - Richard B Lipton
AU  - Marcelo E Bigal
PY  - 2005
DO  - 10.1111/j.1526-4610.2005.05106.x
UR  - https://pubmed.ncbi.nlm.nih.gov/15953271/
ID  - 15953271
ER  -