Experiment	Measurement	Reference
BaBar	\([3.46 \pm 0.18\mbox{ (stat)} \pm 0.37\mbox{ (syst)}] \times 10^{-3}\)	PRD 83, 032004 (2011)
Average	\(\mathbf{[3.46 \pm 0.41\mbox{ (combined)}] \times 10^{-3}}\)