Vlachopoulos C, Xaplanteris P, Alexopoulos N, Aznaouridis K, Vasiliadou C, Baou K, Stefanadi E, Stefanadis C. Divergent effects of laughter and mental stress on arterial stiffness and central hemodynamics. Psychosom Med. 71: 446-53, 2009
Clark A, Seidler A, Miller M. Inverse association between sense of humor and coronary heart disease. Int J Cardiol. 80: 87-8, 2001
Brutsche MH, Grossman P, Müller RE, Wiegand J, Pello, Baty F, Ruch W. Impact of laughter on air trapping in severe chronic obstructive lung disease. Int J Chron Obstruct Pulmon Dis. 3: 185-92, 2008