BPM diagram Clinic's patient treatment

Hello anyone, i have finished my college's assignment about BPM (Bussiness Process Manager) diagram on Clinic's patient treatment.
This is my first diagram about BPM and i'm sure i've made some mistakes, please help me to check it out and improve my BPM.
Scenario:

The patient arrives and presents the appointment card to the receptionist, who will check it against the register and record a tick next to the patient’s name to show that the patient has turned up for the appointment. The patient is asked to take a seat at the reception area and the receptionist advises the check-in clerk by phone that the patient has arrived. The check-in clerk will then come into the reception area and call the patient into the check-in area. The patient is then asked to sign a treatment consent form and his/her vital signs are taken. If the patient is a new patient, he/she is asked to sign a New Patient form. If the patient is not a new patient, his/her record is retrieved from the filing cabinet. The check-in clerk then prepares a treatment from in which the patient’s details and information about vital signs are noted. The patient’s record (or the completed ‘New Patient’ form if the patient is new) and the treatment form are then sent to the treatment nurse who will check all documentation, sign off on the treatment form and send everything to the treatment room for the patient to be called for treatment.

There are 4 Resources (Patient, Receptionist, Check-in Clerk, Treatment Nurse)
and activities as followed:
1: Patient presents the appointment card.
2: Receptionist check it
3: Receptionist note to check-in clerk
4: Clerk call the patient
5: Clerk asked to sign a consent form and collect other information
6: Clerk sends details to the Nurse
7: Nurse check the patients details
8: Patient get treatment.