Experiment	Measurement	Reference
Belle	\([4.31 \pm 0.20\mbox{ (stat)} \pm 0.50\mbox{ (syst)}] \times 10^{-4}\)	PRD 83, 032005 (2011)
Average	\(\mathbf{[4.31 \pm 0.54\mbox{ (combined)}] \times 10^{-4}}\)