Fig 1. Flow diagram of the study.
aDetailed description in 22, bDetailed description in 13, cDetailed description in15, dDetailed description in14, eDetailed description in 23, fDetailed description in16.
Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.