Received: 26 March 2019
Accepted: 29 October 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: This study was approved by the Institutional Review Board for Ethics in Biomedical Research, Hanoi Medical University, Ministry of Health. Patients visited the hospital for diagnosis and treatment. Consent was obtained individually from each patient during medical consultation. Patients for this study were collected by physicians in Hanoi Medical Hospital and National Hospital of Tropical Diseases.
: Not applicable.
: The authors declare that they have no competing interests.