No abstract available
MeSH terms
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Acetaminophen / administration & dosage
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Analgesics, Non-Narcotic / administration & dosage*
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Anti-Inflammatory Agents, Non-Steroidal / administration & dosage*
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Aspirin / administration & dosage
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Caffeine / administration & dosage*
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Chemistry, Pharmaceutical
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Double-Blind Method
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Drug Combinations
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Headache / drug therapy*
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Headache / epidemiology
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Humans
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Randomized Controlled Trials as Topic
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Selection Bias
Substances
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Analgesics, Non-Narcotic
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Anti-Inflammatory Agents, Non-Steroidal
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Drug Combinations
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Acetaminophen
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Caffeine
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Aspirin