由于一本书的预付金常常是分期支付的，目前还不清楚一旦这本书开始销售，预付金的总额会是多少。
It is unclear how much the advance will total once the book hits shelves, since book advances are often distributed in several parts.
理论上，对公共卫生的支付方式有总额预付制、按服务项目付费、按人头支付、薪金制、按照绩效支付、按条目预算、预防服务账户和定期健康就诊费用方式。
Payment system for public health service includes global budget, fee for service, capitation, salary, performance-related pay, line budget, preventive service account and periodic health visit fee.
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