International society of sports nutrition position stand: caffeine and performance
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D. Kalman | R. Kreider | J. Ivy | B. Campbell | R. Wildman | Abbie E. Smith | J. Antonio | C. Wilborn | L. Taylor | J. Stout | T. Ziegenfuss | D. Willoughby | M. Spano | E. Goldstein | S. Graves