Dissemination of Supine PCNL: PubMed search: “Supine Percutaneous Nephrolithotomy” 30 25 20 15 10 5 N=183 Publications/year 0 1994 2002 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017