Wikipedia about Type A and Type B personality theory
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Christian
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https://en.wikipedia.org/wiki/Type_A_and_Type_B_personality_theory
"Type A and Type B personality theory describes two contrasting personality types that could either raise or lower, respectively, one's chances of developing coronary heart disease. There is considerable controversy about the role of these personality types in coronary heart disease and the role of tobacco industry funding of early research in this area."
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