how to retrieve robust se in coxph

Hi,

I am using coxph in simulations and I want to store the "robust se" (or 
"se2" in frailty models) for each replicate. Is there a function to retrieve 
it, like vcov() for the variance estimate? Thanks!
  
Lei Liu
Assistant Professor
Division of Biostatistics and Epidemiology
Dept. of Public Health Sciences
School of Medicine
University of Virginia

3181 Hospital West Complex
Charlottesville, VA 22908-0717

1-434-982-3364 (o)
1-434-806-8086 (c)

liulei at virginia.edu
ll9f at virginia.edu