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Revista Clinica Espanola (English Edition) > 2014 > 214 > 9 > 505-512
Sleep Medicine > 2013 > 14 > 9 > 838-842
The American Journal of Medicine > 2010 > 123 > 8 > 719-726
American Journal of Hypertension > 1998 > 11 > 8 > 1024-1027