What is cause and what is effect?
Department of Medical Sciences, Respiratory Medicine and Allergology, Internal Medicine, Uppsala University, Sweden
Department of Medical Sciences, Internal Medicine, Uppsala University, Sweden
Department of Medical Sciences, Respiratory Medicine and Allergology, Internal Medicine, Uppsala University, Sweden
Department of Medical Sciences, Respiratory Medicine and Allergology, Internal Medicine, Uppsala University, Sweden
Received 23 May 2011; accepted 26 May 2011.
PII: S1389-9457(11)00313-3
doi:10.1016/j.sleep.2011.05.011
© 2011 Published by Elsevier Inc.
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