Joseph Berkson, the longtime head of the medical statistics division at the Mayo Clinic, observed in 1938 that correlations can also arise from a common effect.

约瑟夫·伯克逊，长期担任Mayo诊所的医学统计部领导，他在1938年发现共同的影响也可以导致相关性。

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According to an AHA online survey, the top two reasons women defer heart surgery is "caring for others, " and "family responsibilities, " said Dr. Rakesh Suri, a consultant in the division of cardiovascular surgery at the Mayo Clinic.

MSN: Heart disease can be serious, silent in young women