/**
  * Chargement du patient
  *
  * @return null|CPatient
  */
 function loadRefPatient()
 {
     if (!$this->_avs) {
         return null;
     }
     $patient = new CPatient();
     $patient->avs = $this->_avs;
     $patient->loadMatchingObject();
     return $this->_patient = $patient;
 }