Conflicts of interest
This work was supported in part by the Southern Taiwan Science Park, Taiwan, and Synbiotech Inc (grant 100CB03, production improvement and clinical study on gasterointestinal function of Kefir lactic acid bacteria).
Acknowledgments
We thank Robert Jonas for helpful comments on the manuscript. This work was supported in part by the Southern Taiwan Science Park, Taiwan and Synbiotech Inc., (grant 100CB03 ), and the National Science Council, Taiwan (grant NSC-99-3112-B-006-015 ).