title: [Meta-analysis: trials with melatonin and its effect on the sleep. Letter].
authors.forename: J R
authors.initials: JR
authors.lastname: Valdizán-Usón
authors.forename: F
authors.initials: F
authors.lastname: Romero
authors.forename: M C
authors.initials: MC
authors.lastname: Almárcegui
mesh_terms: D001766:Blindness; D002940:Circadian Rhythm; D006801:Humans; D008550:Melatonin / Q000378:metabolism*; D012890:Sleep / Q000502:physiology*
chemical_list: D008550:Melatonin
vernacular_title: Metanálisis: ensayos de melatonina y su efecto sobre el sueño.