Oh no, maybe I did not explain myself very well.
I contacted the professor I am interested in working with before sending my application, and he is the one who told me about different committees.
Sorry for the misunderstanding, until now I have only been invited to Emory's interview day.
For which area of specialization? Because the professor with whom I talked to told me that each area of specialization of the epidemiology field of study has his own committee, and I am wondering if they are sending invitations at different times.