Experiment	Measurement	Reference
Belle	\([4.7 \pm 1.6\mbox{ (stat)} \pm 0.8\mbox{ (syst)}] \times 10^{-4}\)	PRL 111 (2013) 032001
Average	\(\mathbf{[4.7 \pm 1.8\mbox{ (combined)}] \times 10^{-4}}\)