DISCLAIMER: THIS WEB SITE IS DR. SINGER’S PERSONAL WEB SITE AND ALL OF THE VIEWS EXPRESSED ARE DR. SINGER’S PERSONAL VIEWS. NONE OF THE VIEWS EXPRESSED ARE THOSE OF LEHIGH VALLEY HEALTH NETWORK OR ANY OTHER INSTITUTION OR CORPORATION. THIS SITE IS NOT TO BE USED AS A SUBSTITUTE FOR MEDICAL ATTENTION.  IF YOU ARE EXPERIENCING PROBLEMS WITH YOUR HEART OR LUNGS, PLEASE CONTACT YOUR DOCTOR OR HEALTH-CARE PROFESSIONAL FOR MEDICAL ADVICE AND TREATMENT.