Experiment	Measurement	Reference
Belle	\([0.80 \pm 0.20\mbox{ (stat)} \pm 0.10\mbox{ (syst)}] \times 10^{-4}\)	PRD 81, 031103(R) (2010)
Average	\(\mathbf{[0.80 \pm 0.22\mbox{ (combined)}] \times 10^{-4}}\)