Different caffeine preparations.
Rasmussen
K G
KG
Brink
D D
DD
Soine
W H
WH
D002110:Caffeine / Q000008:administration & dosage* / Q000009:adverse effects / Q000737:chemistry; D000697:Central Nervous System Stimulants / Q000008:administration & dosage* / Q000009:adverse effects / Q000737:chemistry; D004565:Electroconvulsive Therapy; D006801:Humans
D000697:Central Nervous System Stimulants; D002110:Caffeine