TY  - RPRT
TI  - Illness behavior and chronic headache.
AU  - Stefan Demjen
AU  - Donald Bakal
PY  - 1981
DO  - 10.1016/0304-3959(81)90197-4
UR  - https://pubmed.ncbi.nlm.nih.gov/7267138/
ID  - 7267138
ER  -