Brinkman, H.R., Kowalchyk, M.L., Cahn, L., Aaronson, C.J., Böttche, M., Presseau, C., Markowitz, J.C., Litz, B.T., Huckins, L., Yehuda, R., Knaevelsrud, C., Pietrzak, R.H. and Feder, A. 2021. Internet-based cognitive behavioral therapy versus internet-based modified present-centered therapy for world trade center responders and survivors with posttraumatic stress disorder: rationale and design of a randomized controlled trial. International Journal of Clinical Trials. 8, 3 (Jul. 2021), 202–210. DOI:https://doi.org/10.18203/2349-3259.ijct20212843.