Experiment	Measurement	Reference
Belle	\([3.16 \pm 0.35\mbox{ (stat)} \pm 0.32\mbox{ (syst)}] \times 10^{-4}\)	Phys. Rev. D 93, 052016 (2016)
Average	\(\mathbf{[3.16 \pm 0.47\mbox{ (combined)}] \times 10^{-4}}\)