Refer to your answer to Problem and Exercise 2-51 in Chapter 2. The description for DocIT explained that there were to be data in the database about people who are not patients but are related to patients. Also, it is possible for some staff members to be patients or to be related to patients. And, some staff members have no reason to see patients in appointments, but these staff members provide functions related to only claims processing. Develop supertypes and subtypes to more clearly represent these distinctions, and draw a new EER diagram to show your revised data model.