cox proportional-hazards regress for interval censor data

Hi. I used coxph(surv(start,end,event)~~event,data) to deal with interval 
censor data.
Does anyone know similar samples using 
coxph(surv(start,end,event)~~event,data)?
If you knows, can you tell me? I'll really appreciate it.

Thank you very much




R learner.