Article 16 Having confirmed that a victim of traffic in minors is present within their jurisdiction, the competent authorities of a State Party shall take such immediate measures as may be necessary for the minor's protection, including those of a preventive nature to ensure that the minor is not improperly removed to another State. The Central Authorities shall inform the competent authorities of the State of the minor's previous habitual residence of all such measures. The intervening authorities shall take such steps as may be necessary to keep the persons or authorities seeking the minor's location and return duly informed of the measures adopted. Article 17 In keeping with the purposes of this Convention, the Central Authorities of the States Parties shall exchange information and cooperate with their competent judicial and administrative authorities on all matters concerning control of the entry of minors into and departure from their territories. Article 18 Adoptions and other similar legal proceedings performed in a State Party shall be subject to annulment if they had their origin or purpose in international traffic in minors. In such annulment, the minor's best interests shall be taken into account at all times. The annulment shall be subject to the law and the competent authorities of the State where the adoption or legal proceedings concerned took place. Article 19 Care or custody of a minor may be revoked whenever it has its origin or purpose in the international traffic in minors, under the same conditions provided for in the preceding article. Article 20 A request for locating and returning a minor may be lodged without prejudice to the annulment and revocation actions provided for in Articles 18 and 19. Article 21 In any proceeding provided for under this chapter, the competent authority may order the person or organization responsible for international traffic in minors to pay the costs and expenses of locating and returning the minor if such person or organization is a party to the proceeding. A person or authority lodging a request for the return or, where applicable, the competent authority may bring a civil action to recover costs, including legal fees and the expenses of locating and returning the minor, unless said costs were already assessed in a criminal proceeding or a proceeding under this chapter. The competent authority or any injured person or authority may bring a civil action for damages against the persons or organizations responsible for the international traffic in minors involving the minor.