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.
Non-defined = not fulfilling the definitions for red cell production failure, haemolysis or blood loss. Number and percentage given: mechanism sub-groups not overlapping (black) and overlapping (red).
