- Anxiety sensitivity: a unique predictor of dropout among inner-city heroin and crack/cocaine users in residential substance use treatment. Lejuez, C.W., Zvolensky, M.J., Daughters, S.B., Bornovalova, M.A., Paulson, A., Tull, M.T., Ettinger, K., Otto, M.W. Behav. Res. Ther (2008)