Thank you! It was epi.
I had it yesterday and it went ehhhh due to technical issues but I think they appreciated that I mustered through, but the issues led to a frazzled brain so I'm not sure I was as specific or eloquent as I could have been.
In case anyone's interested, questions asked were pretty standard, why PhD, why public health, why epi, why USF. Then, describe strengths, weaknesses, as they pertain to PhD work. Also, how do I address setbacks.
Good luck everyone!