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. HSF 2009, 12, E35-E38.