Affiliations: Additional Professor of Pediatric Allergy and
Immunology, Department of Pediatrics, Advanced Pediatric Centre, Post Graduate
Institute of Medical Education and Research, Chandigarh-160012, India. Fax:
+91 172 2744401; +91 172 2745078; E-mail: surjitsinghpgi@rediffmail.com;
surjitsinghpgi@hotmail.com