Proc hpgenselect with matched data

[Liamb]

Hello,

How to apply stepwise selection with proc hpgenselect to matched data?

Thanks

proc hpgenselect data=tab;
class paired var1 var2 var3 var4 ;
model wbc= var1 var2 var3 var4/ dist = negbin link=log ; 
/*random intercept / subject=paired;*/
selection method=stepwise details=all;

run;