TY  - RPRT
TI  - Severe headache and vacation.
AU  - M Sillanpää
AU  - L Koivusilta
PY  - 1989
DO  - 10.1111/j.1526-4610.1989.hed2909574.x
UR  - https://pubmed.ncbi.nlm.nih.gov/2583995/
ID  - 2583995
ER  -