. 2017 Mar 22;73(Pt 4):228–234. doi: 10.1107/S2053230X17004022
© International Union of Crystallography 2017
Prior permission is not required to reproduce short quotations, tables and figures from this article, provided the original authors and source are cited. For more information, see http://journals.iucr.org/services/copyrightpolicy.html.