Guspa A, Haru Pradani W, Zakinov Irta A, Akbar A. Article RETRACTED due to malpractice When the audience matters: a systematic review of spectator influence on sports performance. Retos [Internet]. 2025 July 16 [cited 2026 Nov. 7];70:921-30. Available from: https://www.revistaretos.org/index.php/retos/article/view/116288