Do smoking prevention programs really work? Attrition and the internal and external validity of an evaluation of a refusal skills training program.
Biglan A, Severson H, Ary D, Faller C, Gallison C, Thompson R, Glasgow R, Lichtenstein E. Do smoking prevention programs really work? Attrition and the internal and external validity of an evaluation of a refusal skills training program. J Behav Med. 1987 Apr; 10(2):159-71.