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Freitas J, Loureiro E, Santos R, Carvalho MJ, de Freitas AF.Freitas J, et al.Rev Port Cardiol. 2002 May;21(5):597-609.Rev Port Cardiol. 2002.PMID: 12174522Review.English, Portuguese.
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Freitas J, Santos R, Azevedo E, Costa O, Carvalho M, de Freitas AF.Freitas J, et al.Clin Auton Res. 2000 Oct;10(5):293-9. doi: 10.1007/BF02281112.Clin Auton Res. 2000.PMID: 11198485Clinical Trial.