Lifson, AR, Hessol, NR, O'malley, PM et al. (1991). The authors reply
. American Journal of Epidemiology, 133(5), 515-516. 10.1093/oxfordjournals.aje.a115922
Lifson, AR, Hessol, NR, O'malley, PM et al. (1991). The authors reply
. American Journal of Epidemiology, 133(5), 515-516. 10.1093/oxfordjournals.aje.a115922