. 2008 Apr 15;2:38–43. doi: 10.2174/1874091X00802010038
© Weichel et al.; Licensee Bentham Open.
This is an open access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.5/), which permits unrestrictive use, distribution, and reproduction in any medium, provided the original work is properly cited.