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Humming Is as Effective as Valsalvaæs Maneuver and Trendelenburgæs Position for Ultrasonographic Visualization of the Jugular Venous System and Common Femoral Veins |
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Valsalva: Much more than a simple maneuver. Antonio Maria Valsalva (1666-1723) | [Vasalva mucho más que una maniobra. Antonio María Valsalva (1666-1723)] |
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