TY  - GEN
AU  - Halpern,John H
TI  - Reply to: 'illicit drugs and cluster headache: an inevitable discussion'
SN  - 1468-2982
PY  - 2014///0121
KW  - Cluster Headache
KW  - epidemiology
KW  - Female
KW  - Humans
KW  - Illicit Drugs
KW  - Male
KW  - Substance-Related Disorders
N1  - Publication Type: Letter; Comment
UR  - https://doi.org/10.1177/0333102413480753
ER  -