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The number of co-workers is given as twenty-seven, with assistance of nineteen more. Aided by the Marshall Plan, a comprehensive study was undertaken with the view to correlate various factors of somatic and psychic growth and development, including such environmental conditions as family and social situation. The studies were carried out in six different localities. The intention was to follow a certain number of children from entrance to grade school to graduation from grade school; that is, boys and girls from about six to fourteen years of age. At this time only the results of the first year (1952), based on 4400 children, were available, the majority of which necessarily belonged to the school-entrance group. The group of workers in each locality consists of a physician, a psychologist, and a welfare worker, with their assistants. Uniform methods of examination and tests were adopted. The procedures are given in detail in
Deutsche Nachkriegskinder.. AMA Am J Dis Child. 1956;91(4):417. doi:10.1001/archpedi.1956.02060020419027