Draw the Relational Database Schema Diagram, then show the Functional Dependency an'd Referential Integrity for the following Hospital Invoice Database:

ACCOUNT $($InvoiceNbr$,$ AccountNbr, InvoiceDate, DueDate, DateAdmitted, DateDischarged$)$ PATIENT $($PatientNbr$,$ PatientName, PatientAddress, City, State, Zip$)$

PATIENT$\_$CHARGES $($InvoiceNbr$,$ ItemCode, Charge$)$

ITEM $($ItemCode$,$ Description$)$

ADMISION $($PatientNbr$,$ DateAdmitted, DateDischarged, Location$)$

ROOM $($Location$.$ Accommodation, Extension$)$

OCCUPANCY $($Location$,$ DateAdmitted, PatientNbr$)$

PROCEDURE$\_$LOCATION $($PatientNbr$,$ Proceduredate, Location$)$

ACCOUNT$\_$P$$TIENT $($AccountNbr$,$ PatientNbr$)$

Note: The Relational Schema above is in $3^{rd}$ Normal Form relations with the Functional Dependencies and Referential Integrity constraints.