Key points are not available for this paper at this time.
Department of Medicine, University of North Carolina, Chapel Hill, USA. Correspondence and requests for reprints to Steven R. Steinhubl MD, Associate Professor of Medicine, University of North Carolina, CB#7075, Chapel Hill, NC 27599-7075, USA. Tel: + 1919 843 5222; fax: + 1 919 966 1743; e-mail: email protected
Steven R. Steinhubl (Fri,) studied this question.