Create an ER Diagram :

Patient:

Attributes: PatientID $($PK$),$ Name, ContactInfo, Address, Age, Weight, Height, InsuranceInfo, SSN$.$

Candidate Key: PatientID.

Doctor:

Attributes: DoctorID $($PK$),$ Name, Specialization, ContactInfo.

Candidate Key: DoctorID.

Room:

Attributes: RoomNumber $($PK$),$ RoomType, Availability.

Candidate Key: RoomNumber.

Staff:

Attributes: StaffID $($PK$),$ Name, Role, ContactInfo.

Candidate Key: StaffID.

Treatment:

Attributes: TreatmentID $($PK$),$ TreatmentDetails, Date, StaffID $($FK$),$ PatientID $($FK$).$

Candidate Key: TreatmentID.

Relationship Sets:

Patient$-$Doctor:

Descriptive Attributes: None.

Associated Entities: Patient, Doctor.

Cardinality Constraints: One$-$to$-$Many $($One patient can be assigned to one doctor, one doctor can have many patients$).$

Participation Constraints: Total participation on the patient side, partial on the doctor side.

Patient$-$Room:

Descriptive Attributes: AdmissionDate, DischargeDate.

Associated Entities: Patient, Room.

Cardinality Constraints: One$-$to$-$One $($One patient is assigned one room, one room can be assigned to one patient at a time$).$

Participation Constraints: Partial participation on both sides.

Patient$-$Treatment:

Descriptive Attributes: None.

Associated Entities: Patient, Treatment.

Cardinality Constraints: One$-$to$-$Many $($One patient can have multiple treatments, each treatment is for one patient$).$

Participation Constraints: Total participation on the treatment side, partial on the patient side.

Staff$-$Treatment:

Descriptive Attributes: None.

Associated Entities: Staff, Treatment.

Cardinality Constraints: One$-$to$-$Many $($One staff member can perform multiple treatments, each treatment is performed by one staff member$)$

In the format like the picture.