Ravesloot, M J L Positional OSA part 2: retrospective cohort analysis with a new classification system (APOC). [electronic resource] - Sleep & breathing = Schlaf & Atmung May 2016 - 881-8 p. digital Publication Type: Journal Article ISSN: 1522-1709 Standard No.: 10.1007/s11325-015-1206-y doi Subjects--Topical Terms: Cohort StudiesCross-Sectional StudiesEquipment DesignHumansPatient Positioning--instrumentationPatient SelectionPolysomnographyPostureRetrospective StudiesSleep Apnea, Obstructive--classification