Olson, S H; Kelsey, J L; Pearson, T A et al. (1994) Characteristics of a hypothetical group of hospital controls for a case-control study. Am J Epidemiol 139:302-11 |
Olson, S H; Kelsey, J L; Pearson, T A et al. (1992) Evaluation of random digit dialing as a method of control selection in case-control studies. Am J Epidemiol 135:210-22 |