We also registered at Medpark, received a confirming email and went Friday AM, wifes a dual citizen, US/Thai, used her US Passport, she's also invalid in wheelchair, we were taken to the front of Q and we didn't ask but were given Pfizer. They did ask if I had health issues, yep heart disease so guess that was it. It was a very well run and can't say anything negative about the experience. Back Sept 3rd for second jab. That is a great hospital.