TY  - RPRT
TI  - Headache studies; statistical data. I. Procedure and sample distribution.
AU  - H D OGDEN
PY  - 1952
DO  - 10.1016/0021-8707(52)90074-9
UR  - https://pubmed.ncbi.nlm.nih.gov/14907277/
ID  - 14907277
ER  -