1. Medtronic, Inc, Minneapolis, MN (B.H., N.K., N.B., B.O., S.F., M.T.S.).
2. Oakland University William Beaumont School of Medicine, Royal Oak, MI (D.E.H.).
3. Southlake Regional Health Centre, Newmarket, ON, Canada (A.V.).
4. Mayo Clinic, Rochester, MN (D.P.).
5. University of Ljubljana, Slovenia (D.M.).