Studies on the o-Aminophenol Azo-Tuberculin Derivative: Report 18. Comparative Skin Test with old Tuberculin, Various Amount of o-Aminophenol Azo-Tuberculin "Human" and o-Aminophenol Azo-Tuberculin "BCG" in BCG inoculated Scool-Children (No. 2) Result on 3 months after BCG Inoculation