1 “... in different parts of the world twice a year, and World Congresses dealing with all individual fields...”

2 “... in different parts of the world twice a year, and World Congresses dealing with all individual fields...”

3 “... in different parts of the world twice a year, and World Congresses dealing with all individual fields...”

4 “... in different parts of the world twice a year, and World Congresses dealing with all individual fields...”

5 “... in different parts of the world twice a year, and World Congresses dealing with all individual fields...”

6 “... in different parts of the world twice a year, and World Congresses dealing with all individual fields...”