Experiment	Measurement	Reference
Belle	\([2.0 ^{+0.3}_{-0.3}\mbox{ (stat)} \pm 0.3\mbox{ (syst)}] \times 10^{-6}\)	PRL 97, 162003 (2006)
Average	\(\mathbf{[2.0 ^{+0.5}_{-0.4}\mbox{ (combined)}] \times 10^{-6}}\)