Reply to the letter of Harlan and Davey, PAIN, 47 (1991) 245.
Ward
Nicholas M D
NMD
Dept. of Psychiatry and Behavioral Sciences University of Washington Seattle, WA 98195, USA.
D002110:Caffeine / Q000627:therapeutic use*; D006261:Headache / Q000503:physiopathology*; D006801:Humans; D010147:Pain Measurement; D010919:Placebos
D010919:Placebos; D002110:Caffeine