The SEER database is a comprehensive cancer statistics database that contains 17 population-based cancer registries that account for 28% of the US population and record information on individuals with malignant tumours in the United States. We first submitted the data consent form to the SEER administration and then collected the relevant data using SEER*Stat version 8.3.5. The information presented in this study is based on the most recent follow-up (May 30, 2020) available in the SEER database. Informed consent was not necessary in our investigation since the data gathered from the SEER database were anonymized prior to release.
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