1. Department of Cardiology; Advanced Cardiac Centre; Post Graduate Institute of Medical Education and Research; Chandigarh India
2. Pediatric Allergy and Immunology Unit; Advanced Pediatrics Centre; Post Graduate Institute of Medical Education and Research; Chandigarh India
3. Department of Internal Medicine; Post Graduate Institute of Medical Education and Research; Chandigarh India
4. Department of Radiodiagnosis; Post Graduate Institute of Medical Education and Research; Chandigarh India
5. San Diego Cardiac Centre and Sharp Memorial Hospital; San Diego CA USA