TY  - RPRT
TI  - Headache in general practice.
AU  - C Philips
PY  - 1977
DO  - 10.1111/j.1526-4610.1976.hed1606322.x
UR  - https://pubmed.ncbi.nlm.nih.gov/830622/
ID  - 830622
ER  -