LI, Q.; ZHANG, J.; LI, B.; WANG, W.; LIU, J.; ZHU, H.; WANG, H.; YU, S.; CUI, Q.; SUN, G.; WU, X.; YI, D. Pulse Oxygen Saturation Measured in Standing and Squatting Positions May Be Useful in Evaluating Tetralogy of Fallot. The Heart Surgery Forum, v. 12, n. 1, p. E35-E38, 20 Feb. 2009.