Erratum to: Sleep Breath

DOI 10.1007/s11325-011-0544-7

Footnote line 1: change "X.Zhang and X.-B. Zhang contributed equally to this work" to "QC Lin and X.B Zhang contributed equally to this work"

Footnote line 2–3: change "Q.-C.Lin* X.-B. Zhang* G.-P. Chen* D.-Y. Huang* H.-B. Din* A.-Z. Tang" to "QC Lin* XB. Zhang* GP. Chen* DY. Huang* HB. Din* AZ. Tang"