Tokyo, Oct. 21 -- UMIN Clinical Trials Registry (UMIN-CTR) received information related to the study (UMIN000059479) titled 'A study on how caffeine affects concentration in relation to genetic factors' on Oct. 20. Study Type: Interventional Study Design: Basic Design - Cross-over Randomization - Randomized Blinding - Double blind -all involved are blinded Control - Placebo Primary Sponsor: Institute - Waseda University Condition: Condition - Not applicable Classification by malignancy - Ot...