Effects of Diaphragmatic Breathing Exercise on Respiratory Functions and Vocal Sustenance in Apparently Healthy Vocalists by Chukwu, Sylvester Caesar, Egbumike, Chukwuenyegom Joseph, Ojukwu, Chidiebele P, Uchenwoke, Chigozie, Igwe, Emeka S, Ativie, Nkechi R, Okemmuo, Adaora J, Chukwu, Nkem P, Ezeugwu, Uchechukwu A, Ikele, Chioma N, Uduonu, Ekezie M

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