... trial \ensuremath{\diamond}
D. Boerma, E. A. Rauws, Y. C. Keulemans, I. M. Janssen, C. J. Bolwerk, R. Timmer, E. J. Boerma, H. Obertop, K. Huibregtse, and D.J. Gouma. Wait and see policy or laparoscopic cholecystectomy after endoscopic sphincterotomy for bile duct stones: A randomised trial Lancet, 360(9335):761-5, 2002.
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