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. 2024 Dec 12;34(1):155–173. doi: 10.1044/2024_AJSLP-24-00016

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A timeline showing two phases of a study. Phase 1 is represented by a green bar and Phase 2 is represented by a blue bar. The timeline is divided into five time points, labeled T1 through T5. At T1, baseline testing is conducted. This is followed by an 8-week intervention period, labeled Intervention One, where participants receive 15 sessions of 1-hour treatment, 3-5 sessions per week. At T2, there is 1-week post-treatment testing period. At T3, there is testing after an 8-week washout period, which also serves as baseline testing for intervention 2. At T4, there is testing at 1-week post-treatment. This is followed by an intervention period, labeled Intervention Two, where participants receive 15 sessions of 1-hour treatment, 3-5 sessions per week. At T5, there is 1-week post-testing for Intervention 2. Finally, there is 8-week post-testing for Intervention 2. — Study design. Components of Phase 1 assessment and treatment are depicted in green, and components of Phase 2 assessment and treatment are depicted in blue.