Effects of CPAP therapy withdrawal on exhaled breath pattern in obstructive sleep apnoea by Stradling, J, Schwarz, E, Sinues, P, Bregy, L, Gaisl, T, Gomez, D, Gaugg, M, Suter, Y, Stebler, N, Nussbaumer-Ochsner, Y, Bloch, K, Zenobi, R, Kohler, M