How will your patients be cared for when you’re not available, such as with illness or for your vacation?
Coverage for the absence of a staff member is usually a requirement stated in any organization's by-laws. That is, if you're on staff, your patients shouldn't go without care: you're required to make arrangements for these gaps of coverage. If you're familiar with the practitioners in the area, you can request from others on staff a reciprocal on-call relationship; if you're new, you can state that you'll be serving on committees that will allow you to meet others allied to your specialty so that you can make such arrangements.
"I'm going to serve on committees within your Pediatrics, Internal Medicine, Family Practice, and Gynecology departments so that I can arrange reciprocal call agreements with staff members. In the beginning, when my patient base is still small, however, I probably won't be taking much time off."