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This peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in Biology Direct are listed in PubMed and archived at PubMed Central. For information about publishing your research in Biology Direct or any BioMed Central journal, go to http://www.biology-direct.com/info/instructio...

Like all articles in BMC journals, this peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in BMC journals are listed in PubMed and archived at PubMed Central. For information about publishing your research in BMC journals or any BioMed Central journal, go to http://www.bio...

This peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in BMC Research Notes are listed in PubMed and archived at PubMed Central. For information about publishing your research in BMC Research Notes or any BioMed Central journal, go to http://www.biomedcentral.com/info/ins...

Like all articles in BMC journals, this peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in BMC journals are listed in PubMed and archived at PubMed Central. For information about publishing your research in BMC journals or any BioMed Central journal, go to http://www.bio...

Like all articles in BMC journals, this peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in BMC journals are listed in PubMed and archived at PubMed Central. For information about publishing your research in BMC journals or any BioMed Central journal, go to http://www.bio...

This peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in Philosophy, Ethics, and Humanities in Medicine are listed in PubMed and archived at PubMed Central. For information about publishing your research in Philosophy, Ethics, and Humanities in Medicine or any BioMed Cent...

This peer-reviewed article was published immediately upon acceptance. It can be downloaded, printed and distributed freely for any purposes (see copyright notice below). Articles in Patient Safety in Surgery are listed in PubMed and archived at PubMed Central. For information about publishing your research in Patient Safety in Surgery or any BioMed Central journal, go to http://www.pssjournal.c...