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Ronald A. Bernstein, Linda H. Werner, Alfred A. Rimm, Relationship of Gallbladder Disease to Parity, Obesity, and Age: A Study of 62,739 Weight-Conscious Women, Health Services Reports, Vol. 88, No. 10 (Dec., 1973), pp. 925-936
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Bernstein et al. (1973) studied this question.
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