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We introduce a method for constructing an element-by-element sparse approximate inverse (SAI) preconditioner designed to be effective in a massively-parallel spectral element modeling environment involving non-symmetric systems. This new preconditioning approach is based on a spectral optimization of a low-resolution pre-conditioned system matrix (PSM). We(More)
Abstract Purpose: We performed a systemic review with meta-analysis to compare tubeless vs conventional percutaneous nephrolithotomy (PCNL) and assess the effectiveness and safety of this innovative procedure. Materials and Methods: A systematic review of PUBMED, EMBASE, LILACS, and Cochrane Library was performed to identify all randomized controlled trials(More)
PURPOSE To assess the quality of reporting of randomized controlled trials (RCTs) presented in abstract form at the annual World Congress of Endourology (WCE) and evaluate their course of subsequent publication. MATERIALS AND METHODS All RCTs presented in abstract form at the 2004, 2005, and 2006 WCE annual meetings were identified for review. Quality of(More)
OBJECTIVE To determine whether preoperative cystometry and a pressure flow study (PFS) are necessary in patients with end-stage renal disease from nonurologic causes who will undergo renal transplantation. METHODS From April 2009 to June 2010, 30 patients scheduled to undergo renal transplantation were prospectively evaluated with cystometry and PFS. The(More)
PURPOSE We performed a nationwide survey of Brazilian urologists to study behaviors toward radiation exposure and the use of protective and monitoring equipment. METHODS A 13-question e-mail questionnaire was sent to 4,526 Brazilian urologists; the questions addressed demographic characteristics, radiation exposure, and the utilization of shielding(More)
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