Very helpful everyone - thank you!

Quick question: do I need a referral to get an appointment with Dr. Kwon or his team at Mayo? I followed Mayo's online process for requesting an appointment. I went through the first round of questions over the phone, and I said I would like to setup an appointment with Dr. Kwon. The individual I was talking with was with Mayo Radiation Oncology (someone in their intake dept). They said I'd be getting a call back from scheduling. It's been about a week and I have not got a call back from scheduling. What is a reasonable amount of time to expect a call back or do I need a referral?