From December 1, 2002, through November 30,
2006, 494 infants were screened and 325 were
recruited from 42 hospitals (Fig. 1). The infants
were from the United Kingdom (277), Hungary
(24), Sweden (18), Israel (4), and Finland (2). Baseline
characteristics of the infants (including maternal
characteristics) were broadly similar between
the two groups (Table 1).