Figure 1.
Procedure and criteria for selection of sample.
Abbreviations: ASL, local health care units; DPC, drugs supplied by hospitals through local pharmacies; SSN, National Health Service.
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.