Experiment	Measurement	Reference
Belle	\([3.52 \pm 0.52\mbox{ (stat)} \pm 0.24\mbox{ (syst)}] \times 10^{-4}\)	Phys. Rev. D 93, 052016 (2016)
Average	\(\mathbf{[3.52 \pm 0.57\mbox{ (combined)}] \times 10^{-4}}\)