Article controlled study 111 human 100 Humans 74 male 68 female 63 nonhuman 63 adult 59 Female 40 Male 40 unclassified drug 39 metabolism 37 chemistry 35 Adult 29 diagnostic imaging 28 major clinical study 27 physiology 26 priority journal 26 animal experiment 24 clinical article 24 middle aged 24 nuclear magnetic resonance imaging 24 Middle Aged 22 pathology 22 pathophysiology 22 Animals 21 animal 21 Magnetic Resonance Imaging 19 nerve cell network 19 human cell 18