Effect of a nutraceutical combination on sleep quality among people with impaired sleep: a randomised, placebo-controlled trial by Sebastián Antonio Gutiérrez-Romero, Erika Sofía Torres-Narváez, Adrián Camilo Zamora-Gómez, Silvana Castillo-Castillo, Angela Liliana Latorre-Velásquez, Carolina Betancourt-Villamizar, Carlos O. Mendivil

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