The cases came from 39 National Program of Cancer Registries and 5 Surveillance, Epidemiology, and End Results statewide registries, which together represent over 90 per cent of the US population.

• 这些病例来自于39个国家癌症登记计划单位、5个监督、流行病学与最终结果分析州登记处的数据；这些数据代表超过90%25美国人口。