The national cost studies referred to in Article L. 6113-11 may cover the following fields of activity:
1° The activities mentioned in 1° of article R. 162-33 of the Social Security Code;
2° The activities mentioned in 2° of this article;
3° The activities mentioned in 1° of article R. 162-22 of the same code;
4° The activities mentioned in article R. 162-34 of the same code.