The total 41 risk sets for the example data (taken from Appendix D in reference 10).
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a Cytomegalovirus immune status: 1 if CMV positive, and 0 if otherwise.b Methotrexate usage: 1 if MTX being used, and 0 if otherwise.The total 41 risk sets for the example data (taken from Appendix D in reference 10).
创建时间：
2015-12-03
