[R] retrieve p-value from a cox.obj

[Terry Therneau]

 Several responders have given input on how to find and read the code for
summary.coxph and print.coxph, or using str() to examine the output of a 
coxph object.

  An even better starting place would be the documentation (yes there is some).
  
help(coxph) gives a page that contains:

  "Value:  an object of class coxph.  See 'coxph.object' for details."
  
and help(coxph.object) gives a description of all the components.

	Terry Therneau