3. Elections of the members of the Committee shall be held at biennial meetings of States Parties convened by the Secretary-General of the United Nations. At those meetings, for which two thirds of the States Parties shall constitute a quorum, the persons elected to the Committee shall be those who obtain the largest number of votes and an absolute majority of the votes of the representatives of States Parties present and voting. 4. The initial election shall be held no later than six months after the date of the entry into force of this Convention. At. Ieast four months before the date of each election, the Secretary-General of the United Nations shall address a letter to the States Parties inviting them to submit their nominations within three months. The Secretary-General shall prepare a list in alphabetical order of all persons thus nominated, indicating the States Parties which have nominated them, and shall submit it to the States Parties. 5. The members of the Committee shall be elected for a term of four years. They shall be eligible for re-election if renominated. However, the term of five of the members elected at the first election shall expire at the end of two years; immediately after the first election the names of these five members shall be chosen by lot by the chairman of the meeting referred to in paragraph 3 of this article. 6. If a member of the Committee dies or resigns or for any other cause can no longer perform his Committee duties, the State Party which nominated him shall appoint another expert from among its nationals to serve for the remainder of his term, subject to the approval of the majority of the States Parties. The approval shall be considered given unless half or more of the States Parties respond negatively within six weeks after having been informed by the Secretary-General of the United Nations of the proposed appointment. 7. States Parties shall be responsible for the expenses of the members of the Committee while they are in performance of Committee duties. Article 18 1. The Committee shall elect its officers for a term of two years. They may be re-elected. 2. The Committee shall establish its own rules of procedure, but these rules shall provide, inter alia, that: (a) Six members shall constitute a quorum; (b) Decisions of the Committee shall be made by a majority vote of the members present. 3. The Secretary-General of the United Nations shall provide the necessary staff and facilities for the effective performance of the functions of the Committee under this Convention. 4. The Secretary-General of the United Nations shall convene the initial meeting of the Committee. After its initial meeting, the Committee shall meet at such times as shall be provided in its rules of procedure. 5. The States Parties shall be responsible for expenses incurred in connection with the holding of meetings of the States Parties and of the Committee, including reimbursement to the United Nations for any expenses, such as the cost of staff and facilities, incurred by the United Nations pursuant to paragraph 3 of this article. Article 19 1. The States Parties shall submit to the Committee, through the Secretary-General of the United Nations, reports on the measures they have taken to give effect to their undertakings under this Convention, within one year after the entry into force of the Convention for the State Party concerned. Thereafter the States Parties shall submit supplementary reports every four years on any new measures taken and such other reports as the Committee may request.