Now you see it; now you don't.
Wang
Norman C
NC
Division of Cardiology, Feinberg School of Medicine, Northwestern University, Chicago, Ill, USA. normanwang@hotmail.com
D000369:Aged, 80 and over; D016477:Artifacts; D004562:Electrocardiography; D006801:Humans; D008297:Male; D014202:Tremor