Recurrent Laughter-Induced Syncope
The Neurologist 18:214-215, Gaitatzis, A. & Petzold, A., 2012
Laughing Headache: A Novel Type of Triggered Headache with Response to Divalproex Sodium
Headache 43:801-803, Levin,M. &Ward,T.N., 2003
Gaze-induced Laughter
JNNP 40:815, Leopold,N.A., 1977