TY  - RPRT
TI  - Headache.
AU  - Sharon K Bal
AU  - Gary R Hollingworth
PY  - 2005
DO  - 10.1136/bmj.330.7487.346
UR  - https://pubmed.ncbi.nlm.nih.gov/15705692/
ID  - 15705692
ER  -