контрольная группа
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- Wacholder S., McLaughlin J.K., Silverman D., Mandel J.S. Selection of controls in case-control studies: I. Principles. Am J Epidemiol, 1992; 135: 1019–28. Wacholder S., Silverman D.T., McLaughlin J.K., Mandel J.S. Selection of controls in case-control studies: II. Types of controls. Am J Epidemiol, 1992; 135:1029–41. III. Item. Selection of controls in case-control studies. III. Design options. Am J Epidemiol, 1992; 135:1042–50.