private void updateDoctorComboBoxHelper(Patient currentUser, JComboBox<String> comboBox) {
        // This method takes any combobox that relates to a doctor and fills it up with a user's related doctors.
        Vector<Patient_Doctor> person_Doctor = currentUser.getPersonDoctor();
        comboBox.removeAllItems();
        for (Patient_Doctor getDoc : person_Doctor) {
            comboBox.addItem(getDoc.getDoctor().getUserName());
        }

        if (comboBox.getItemCount() == 0) {
            comboBox.addItem("No Doctors Available");
        }
    }