TY  - RPRT
TI  - Headache classification based on questionnaire data: which symptoms are especially suitable?
AU  - T Köhler
AU  - R Eisentraut
AU  - E Graeber
PY  - 1995
DO  - 10.1016/0895-4356(94)00182-p
UR  - https://pubmed.ncbi.nlm.nih.gov/7769410/
ID  - 7769410
ER  -