What organization elects the 15 judges of the International Court of Justice?

According to Article 4.1 of the Statute of the International Court of Justice, the members of the Court shall be elected by the General Assembly (of the United Nations) and by the Security Council from a list of persons nominated by the national groups in the Permanent Court of Arbitration.

"In the case of Members of the United Nations not represented in the Permanent Court of Arbitration, candidates shall be nominated by national groups appointed for this purpose by their governments under the same conditions as these prescribed for members of the Permanent Court of Arbitration by Article 44 of the Convention of The Hague of 1907 for the pacific settlement of international disputes."