The use of ultrasound for the execution of spinal anesthesia in obese pregnant women: a systematic review. Research, Society and Development, [S. l.], v. 13, n. 10, p. e116131047248, 2024. DOI: 10.33448/rsd-v13i10.47248. Disponível em: https://rsdjournal.org/rsd/article/view/47248. Acesso em: 5 dec. 2025.