Experiment	Measurement	Reference
Belle	\([3.4 \pm 0.4\mbox{ (stat)} \pm 0.7\mbox{ (syst)}] \times 10^{-3}\)	PRD 76:072004,2007
BaBar	\([4.4 \pm 0.4\mbox{ (stat)} \pm 0.7\mbox{ (syst)} \pm 0.0\mbox{ (correlated syst.)}] \times 10^{-3}\)	PRD 74 091101 (2006)
Average	\(\mathbf{[3.9 \pm 0.6\mbox{ (combined)}] \times 10^{-3}}\)