CohenJ. Statistical Power Analysis for the Behavioral Sciences, 2nd ed. Lawrence Erlbaum Associates: Hillsdale, NJ; 1988.
2.
DupontWD, PlummerWD.Jr., Power and sample size calculations: A review and computer program. Control Clin Trials1990;11(2):116–128; doi: 10.1016/0197-2456(90)90005-M
