Study protocol for a randomized controlled trial comparing pulse pressure variation (PPV) and central venous pressure (CVP) guidance for fluid responsiveness assessment in neurosurgical patients undergoing posterior fossa tumor resection in park bench position - Pin on, Pathomporn; Kacha, Srisuluk; Saringkarinkul, Ananchanok; Thanakititham, Nakan (PLoS ONE, 2025)