American journal of respiratory and critical care medicine Criner Gerard J., Sue Richard, Dransfield Mark, Rivas-Perez Hiram, Cardoso Paulo F. G., Hays Steven, Majid Adnan, Pastis Nicholas, Kopas Lisa, Wright Shawn, Hsia David W., Vollenweider Mark, McFadden P. Michael, Machuzak Michael, Sung Arthur, Jarad Nabil, Wahidi Momen M., Wiese Tanya, Sciurba Frank C., Shah Pallav L., de Oliveira Hugo Goulart, Morrissey Brian, Armstrong Brian, Kornaszewska Malgorzata, Hazelrigg Stephen, Krishna Ganesh, 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