public function getFormOfAddress()
    {
        if ($this->getGender() === self::GENDER_MALE && $this->getLastName()) {
            return 'Herr '.$this->getFirstName().' '.$this->getLastName();
        } elseif ($this->getGender() === self::GENDER_FEMALE && $this->getLastName()) {
            return 'Frau '.$this->getFirstName().' '.$this->getLastName();
        }

        return '';
    }