1. Survival Analysis Using SAS: A Practical Guide;Allison,1995
2. The cushion effect;Arbabi;J. Trauma,2003
3. 2000 NASS Injury Coding Manual;Benton,2000
4. Survival Analysis Techniques for Medical Research;Cantor,2003
5. Center for Disease Control, 2006. State-Specific Prevalence of Obesity Among Adults—United States 2005, MMWR 55(36), 985–88.