[1] Semmelweis Univ, Dept Anesthesiol & Intens Therapy, Ulloi St 78, H-1082 Budapest, Hungary
[2] Semmelweis Univ, Dept Anesthesiol & Perioperat Care, Ulloi Uit 78, H-1082 Budapest, Hungary
[3] Hungarian Resuscitat Council, Bem Rakpart 28, H-1011 Budapest, Hungary
[4] Semmelweis Univ, Heart & Vasc Ctr, Gaal Jozsef Ut 9-11, H-1122 Budapest, Hungary
[5] Semmelweis Univ, Hlth Serv Management Training Ctr, Kutvolgyi Ut 2, H-1125 Budapest, Hungary