Inappropriate Use of Sumatriptan:Population Based Register and Interview Study
BMJ 316:1352-1353, Gaist,D.,et al, 1998
Chronic headache:Appropriate Use of Opiate Analgesics
Neurol 44:S18-S24, Markley,H.G., 1994
Abrupt Outpatient Withdrawal of Medication in Analgesic-Abusing Migraineurs
Lancet 337:1442-1443, Hering,T.&Steiner,T.J., 1991