public function getPrescriber(bool $force = false)
    {
        if ($this->nb_prescriber == NULL ||
            $this->nb_prescriber->getId() != $this->getPrescriberId() ||
            $force
        ) {
            $nb_prescriber_id = $this->getPrescriberId();
            if ($nb_prescriber_id === null || $this->getCustomer() === null) {
                $this->nb_prescriber = null;
            } else {
                $this->nb_prescriber = $this->getCustomer()->getUser($nb_prescriber_id);
            }
        }

        return $this->nb_prescriber;
    }