1 Division of Sleep Surgery, Department of Otorhinolaryngology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.
2 Department of Radiology, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.
3 Department of Otolaryngology, Vanderbilt University School of Medicine, Nashville, Tennessee.
4 Division of Sleep Medicine, Department of Medicine, University of Pennsylvania Perelman School of Medicine, Philadelphia, Pennsylvania, USA.
5 Division of Sleep Medicine, Universidad Peruana Cayetano Heredia School of Medicine, Lima, Peru.