A Prospective Randomized Comparative Study of Hyperbaric Ropivacaine vs. Hyperbaric Bupivacaine in Spinal Anesthesia for Elective Infraumbilical Surgeries. - Shetty D; D'souza AS; Sinha S; Podder S; Parthasarathy A; Sridharan H (AANA journal, 2026)