The purpose of this study is to document the developments associated with puberty and determine if any of the children who previously participated in another research study have been diagnosed with cancer. The previous study was a Collaborative Antiviral Study Group (CASG) protocol entitled "Evaluation of Ganciclovir (DHPG) for the Treatment of Symptomatic Congenital Cytomegalovirus Infections." One of the medications used in this study to treat cytomegalovirus (CMV), ganciclovir, has been known to cause cancer and affect the development of gonads (ovaries in females and testes in males) when administered to animals. Children, 9-14 years old, who participated in the previous research study, will participate in this study for 1 day. Subjects will be evaluated by an endocrinologist and will have the following procedures performed: a complete physical examination, a single blood sample collected, an x-ray of the left wrist.