Despite of complications caused by short-term random variation, artificial fluctuations introduced by screening and changes in diagnosis or disease classification as well as completeness of reporting and multiple factors which may affect the risk of developing cancer and progression in specific cancer sites, recent reports suggest an increasing trend for some childhood malignancies which may be worthy of further analysis [ 4 - 12 ].
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Survey on childhood solid malignant tumors in cases admitted to mofid pediatric hospital from 1996-2010: a single-center study.
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