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Dr. Friedman with colleague Ray H. Rosenman from San Francisco, United States, studied 10 years in this field. The result shows the risk that people with a certain type of personality suffer from heart diseases is 3 times higher than people with other types of personality. A large number of clinical experiments demonstrate that for people who suffer from diseases, they have some similar characteristics in both psychology and behavior. There is a featured behavior model among cardiac patients, which is called Type A behavior model. The opposite characteristics are defined as Type B Personality. Later on Type C Personality is added onto the theory.
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