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(/) To promote maternal and child health and welfare and to foster the ability to live harmoniously in a changing total environment; (m) To foster activities in the field of mental health, especially those affecting the harmony of human relations ; (n) To promote and conduct research in the field of health ; (o) To promote improved standards of teaching and training in the health, medical, and related professions ; (p) To study and report on, in co-operation with other specialized agencies where necessary, administrative and social techniques affecting public health and medical care from preventive and curative points of view, including hospital services and social security ; (<q) To provide information, counsel, and assistance in the field of health; (r) To assist in developing an informed public opinion among all peoples on matters of health ; (s) To establish and revise as necessary international nomenclatures of diseases, of causes of death, and of public health practices; (/) To standardize diagnostic procedures as necessary; (#) To develop, establish, and promote international standards with respect to food, biological, pharmaceutical, and similar products ; (v) Generally to take all necessary action to attain the objective of the Organization. CHAPTER 111 Membership and Associate Membership Article 3 Membership in the Organization shall be open to all States. Article 4 Members of the United Nations may become Members of the Organization by signing or otherwise accepting this Constitution in accordance with the provisions of Chapter XIX and in accordance with their constitutional processes. Article 5 The States whose Governments have been invited to send observers to the International Health Conference held in New York, 1946, may become Members by signing or otherwise accepting this Constitution in accordance with the provisions of Chapter XIX and in accordance