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"A thirty year study was conducted by John Hopkins Medical School to find out if a single related cause existed for mental illness, hypertension, malignant tumors, coronary heart disease, and suicide. After studying 1377 people over a thirty-year period, the single common denominator was not diet or exercise. Instead they found instead that the most significant predictor of these five major calamities was a lack of closeness to the parents, especially the father."
John Hopkins Medical Journal (vol. 134, no. 5 (May 1974): 251-270.