Experiment	Measurement	Reference
BaBar	\([0.27 \pm 0.10\mbox{ (stat)} \pm 0.05\mbox{ (syst)}] \times 10^{-3}\)	PRD 83, 032004 (2011)
Average	\(\mathbf{[0.27 \pm 0.11\mbox{ (combined)}] \times 10^{-3}}\)