Results
Sixty-four consecutive children aged between 4 and 16 years were screened (Fig. CONSORT flowchart. Twenty-five patients with complete follow-up (2 years) per group were required according to a sample size calculation, and a total of 55 tickets were randomized in sealed envelopes in advance to allow for potential loss to follow-up.Clinical Characteristics of the Study GroupsThe values are given as the mean, with the range in parentheses.