American journal of respiratory and critical care medicine Criner Gerard J., Sue Richard, Dransfield Mark, Rivas-Perez Hiram, Pastis Nicholas, Cardoso Paulo F. G., Hays Steven, Majid Adnan, Kopas Lisa, Wright Shawn, Vollenweider Mark, McFadden P. Michael, Machuzak Michael, Hsia David W., Sung Arthur, Jarad Nabil, Wiese Tanya, Sciurba Frank C., Shah Pallav L., Wahidi Momen M., de Oliveira Hugo Goulart, Morrissey Brian, Kornaszewska Malgorzata, Hazelrigg Stephen, Krishna Ganesh, Armstrong Brian, Shargill Narinder S., Slebos Dirk-Jan, , A Multicenter Randomized Controlled Trial of Zephyr Endobronchial Valve Treatment in Heterogeneous Emphysema (LIBERATE) 198:9, p. 1151 - 1164 2018