Affiliation and address for correspondence
Department of Functional Diagnostics, Children´s Cardiac Center, Bratislava, Slovakia
Correspondence: Department of Functional Diagnostics Children´s Cardiac Center, Limbova 1,
833 51 Bratislava, Slovakia; tel.: 02 59371 864, fax: 02 54792317,
e-mail: kardi.marek@gmail.com