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Lua i Stíl Chicago (17ú heag.)Derry, C., S. Derry, agus R. Moore. Caffeine as an Analgesic Adjuvant for Acute Pain in Adults. 2012.
Lua MLA (9ú heag.)Derry, C., et al. Caffeine as an Analgesic Adjuvant for Acute Pain in Adults. 2012.
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