title: Behavioral observation scales for measuring children's distress: the effects of increased methodological rigor.
mesh_terms: D000342:Affective Symptoms / Q000175:diagnosis*; D001707:Biopsy, Needle; D001856:Bone Marrow Examination; D005260:Female; D006185:Habituation, Psychophysiologic; D006801:Humans; D008297:Male