TY  - RPRT
TI  - No appointment needed; the headache clinic.
AU  - O Appenzeller
PY  - 1971
DO  - 10.1111/j.1526-4610.1971.hed1103133.x
UR  - https://pubmed.ncbi.nlm.nih.gov/5115599/
ID  - 5115599
ER  -