About the cover: Cover is based on volumetric reconstructions from a series of 3-mm contiguous axial magnetic resonance images of the mandible (gray), tongue (orange/rust), soft palate (pink/purple), lateral parapharyngeal fat pads (yellow), and lateral/posterior pharyngeal walls (green) in a normal subject (top row) and in a patient with sleep apnea (bottom row). For more information, see article by Schwab and colleagues beginning on page 453.