st: xtnberg with robust standard errors

[Andrea Rispoli <andrea.rspl@gmail.com>]

Dear Statalisters,
Is it possible to estimate an xtnbreg model with robust standard errors?
I have tried running xtnbreg fixed effect with  vce(robust) in the
following way but the command has not been recognized:

xtnbreg dep indepvar, fe vce(robust)

Could you please indicate me if I am doing something wrong?
Thank you very much,
AR
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