In this introduction J.G. Valdivia Uría, the father of the supine position for percutaneous surgery, briefly describes the history of patient positioning for percutaneous renal access, the initial cooperation between urologists and radiologists, and the subsequent birth of percutaneous nephrolithotomy in all its steps, thoroughly developed by various urologists during the years. He underlines the advantages of the supine position and presents the contents of the present book, highlighting its exhaustive approach to all related issues and its practical value.
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