[1] Kuopio Univ Hosp, Dept Pediat Surg 2206, FIN-70211 Kuopio, Finland
[2] Kuopio Univ Hosp, Dept Cardiothorac Surg, FIN-70211 Kuopio, Finland
[3] Kuopio Univ Hosp, Dept Anesthesiol & Intens Care, FIN-70211 Kuopio, Finland
[4] Kuopio Univ Hosp, Dept Pediat Cardiol, FIN-70211 Kuopio, Finland