Doc´s opinion is written and edited by Axel F. Sigurdsson MD, PhD, FACC. Dr. Sigurdsson is a cardiologist at the Department of Cardiology at the Landspitali University Hospital in Reykjavik Iceland. He also practices cardiology at Hjartamidstodin (The Heart Center) which is a private heart clinic in the Reykjavik area. He is a Fellow of the American College of Cardiology (ACC), The Icelandic Society of Cardiology and the Swedish Society of Cardiology.