Jian SUN. Improving Stepwise Proportional Hazards Regression Using a SAS Macro. Recent Developments in Medicine and Medical Research Vol. 9, [S. l.], p. 63–71, 2021. DOI: 10.9734/bpi/rdmmr/v9/5241F. Disponível em: https://stm.bookpi.org/RDMMR-V9/article/view/4587. Acesso em: 20 jun. 2026.