The members of the Czech Childhood Diabetes Registry Study Group are acknowledged for an excellent collaboration and we also thank the participating families for their continuing support. We thank especially: S. Kolouskova, M. Snajderova, L. Brazdova, I. Titzova, M. Sykora, M. Svojsik, M. Machalkova, J. Bartosova, L. Tyce, H. Safarikova, J. Maly, P. Skala, V. Janstova, J. Kopriva, R. Machytka, E. Novakova, V. Kratochvil, A. Martiskova, L. Kocinova, P. Mikyska, H. Nemcova, M. Hromadkova, H. Strmenova, J. Soucek, P. Eichl, K. Fiklik, A. Benesova, A. Filakova, E. Hladakova, Z. Jezova, S. Pokorny, B. Cervickova, I. Velesikova, H. Vavrova, J. Fromel, M. Honkova, V. Prokop, J. Havlicek, Y. Ptoszkova, J. Klabochova, R. Zemanova, J. Berankova, J. Gayer, L. Zlamalova, J. Brozova, M. Imramovska, S. Hyckova, J. Skvor, M. Gregora, E. Senkyrova, V. Jamelska, P. Mokros, J. Matejkova, J. Bazant and M. Schubert. The study was supported by the Ministry of Education of the Czech Republic (grant MSM 0021620814) and a grant from the Czech Diabetes Society.