clinic/netforce_clinic/models/address.py

from netforce.model import Model, fields

class Address(Model):
    _inherit="address"
    _fields={
        'fax': fields.Char("Fax"),
        'patient_id': fields.Many2One("clinic.patient", "Patient"),
        "staff_id": fields.Many2One("clinic.staff","Staff"),
    }

Address.register()