Experiment	Measurement	Reference
Belle	\([6.3 \pm 0.9\mbox{ (stat)} \pm 0.6\mbox{ (syst)}] \times 10^{-4}\)	PRL 111 (2013) 032001
Average	\(\mathbf{[6.3 \pm 1.1\mbox{ (combined)}] \times 10^{-4}}\)