Conflict of interest
TKCN, THV, and CL declare that they have no conflicts of interest in relation to this work.
Ethics approval: Hue University of Medicine and Pharmacy.
Author Contributions: TKCN, THV, anh CL designed the study. TKCN, THV collected and analyzed the data of the study. All authors are major contributors in writing the manuscript. All authors read and approved the final manuscript.