Physical activity, exercise, and physical fitness: definitions and distinctions for health-related researchCaspersen, Powell, Christenson1985 Mar-AprTijdschriftartikel
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Epidemiology of community-acquired respiratory tract infections in adults. Incidence, etiology, and impact.Garibaldi1985 Jun 28Tijdschriftartikel
Impact of influenza on mortality in relation to age and underlying disease, 1967-1989.Sprenger, Mulder, Beyer, Van Strik, Masurel1993 AprTijdschriftartikel