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.
Flow chart of participants of the perioperative rehabilitation study and risk stratification. PRE group, preoperative rehabilitation only; POS group, postoperative rehabilitation only; PPO group, pre- and postoperative rehabilitation as well.
