title: A simplified Master's two-step test for preschool children: a preliminary report.
mesh_terms: D002648:Child; D002675:Child, Preschool; D004562:Electrocardiography; D005069:Evaluation Studies as Topic; D005080:Exercise Test; D005260:Female; D006334:Heart Function Tests / Q000379:methods*; D006801:Humans; D008297:Male