A. Buranathawornsom and C. Bunchorntavakul, “Efficacy of lidocaine spray, either alone or in combination with anti-inflammatory throat spray, in alleviating discomfort during unsedated esophagogastroduodenoscopy: A double-blind randomized controlled trial”, J Med Health Sci, vol. 32, no. 2, pp. 118–129, Aug. 2025.