_:vb50955495 "A leukemia that occurs in children."^^ . _:vb50955495 . _:vb50955495 . _:vb50955495 . _:vb50955495 . _:vb50955495 . _:vb50955495 "url:http://www.nlm.nih.gov/medlineplus/leukemiachildhood.html"^^ .