Helen Dunbar and Franz Alexander were instrumental in establishing the earliest organization to study psychological determinants on health.It is called:

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Helen Dunbar and Franz Alexander founded the first organization dedicated to exploring the psychological factors related to physical illness, called Psychosomatic Medicine. This field eventually became known as health psychology. The Society for Behavioral Medicine and American Psychosomatic Association were founded later and are also dedicated to researching the interplay between psychological and physical health. However, the earliest organization focused specifically on this area is Psychosomatic Medicine.

Helen Dunbar and Franz Alexander Were Instrumental in Establishing the Earliest