M. G. Compier J. Braun A. Tjon K. Zeppenfeld R. J. M. Klautz M. J. Schalij S. A. Trines

biagio castaldi pediatric cardiology unit, university of padua, padua italy; pediatric cardiology unit, university of padua, padua italy. tel: +39-3288970999, fax: +39-0498218089 ornella milanesi pediatric cardiology unit, university of padua, padua italy

ines paola monte department of medical and pediatric sciences, university of catania, catania, italy; department of medical and pediatric sciences, university of catania, catania, italy. tel/fax: +39-0953792743

Ananthraj Avinash Bhanwar Ranwa Devendra Bisht Kamal Kapoor Kumari Priti Rajendra Gokhroo Sajal Gupta

anita sadeghpour echocardiography research center, rajaie cardiovascular medical and research center, tehran university medical center, tehran , ir iran azin alizadehasl department of cardiovascular, cardiovascular research center, tabriz university of medical sciences, tabriz, ir iran; cardiovascular department, cardiovascular research center, tabriz university of medical sciences, postal code: 5166615573, tabriz, ir iran, tel/fax: +98-4113363880

seyed hassan seyed sharifi student research committee, school of medicine, north khorasan university of medical sciences, bojnurd, ir iran taha mohammad rezapour student research committee, school of medicine, north khorasan university of medical sciences, bojnurd, ir iran mohsen yaghubi intensive cardiac care unit, 9 day hospital, torbat heydariyeh university of medical sciences, torbat heydariyeh, ir iran; intensive cardiac care unit, 9 day hospital, torbat heydariyeh university of medical sciences, torbat heydariyeh, ir iran. tel: +98-5152226016, fax: +98-5152239311