human 84 preschool child 84 Humans 74 child 74 Child, Preschool 72 Child 60 female 60 male 60 Male 56 Female 54 article 50 Adolescent 46 adolescent 46 Argentina 42 Infant 42 adult 42 infant 42 Adult 40 Infant, Newborn 26 controlled study 26 priority journal 26 newborn 22 Animals 20 animal 20 clinical article 20 Article 18 Middle Aged 18 school child 18 aged 16 genetics 16