Lopushinsky SR, Covarrubia KA, Rabeneck L, Austin PC, Urbach DR. Surg Endosc. 2007; 21(10):1733-7. Epub 2007 Feb 8.
Rojas-Fernandez C, Stephenson AL, Fischer HD, Wang X, Mestre T, Hutson JR, Pondal M, Lee DS, Rochon PA, Marras C. Drugs Aging. 2014; 31(11):805-13. Epub 2014 Sep 17.