Effects of CPAP therapy withdrawal on exhaled breath pattern in obstructive sleep apnoea by Schwarz, EI, Sinues, PM-L, Bregy, L, Gaisl, T, Gomez, DG, Gaugg, MT, Suter, Y, Stebler, N, Nussbaumer-Ochsner, Y, Bloch, KE, Stradling, JR, Zenobi, R, Kohler, M