TY  - RPRT
TI  - Reliability and concurrent validity of headache questionnaire data.
AU  - F Andrasik
AU  - K A Holroyd
PY  - 1980
DO  - 10.1111/j.1526-4610.1980.hed2001044.x
UR  - https://pubmed.ncbi.nlm.nih.gov/7356598/
ID  - 7356598
ER  -