Experiment	Measurement	Reference
Belle	\([3.74 \pm 0.18\mbox{ (stat)} \pm 0.24\mbox{ (syst)}] \times 10^{-4}\)	Phys. Rev. D 93, 052016 (2016)
Average	\(\mathbf{[3.74 \pm 0.30\mbox{ (combined)}] \times 10^{-4}}\)