Ethics approval and consent to participate
This study was based on a prospective non-interventional research on BM that registered in ClinicalTrials.gov (NCT02278016) and was approved by the ethics committee of Xijing Hospital (KY20140916-3). All procedures involving the patients complied with the ethical standards of the institutional and national research committees and with the 1975 Declaration of Helsinki and its later amendments.
Consent for publication
The authors declare that they have no competing interests.
Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.