Figure 1. Summary of methods: Phase 1 identification of the literature. Phase 2 generation of an initial model; Phase 3 iterative improvement of the model.
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.