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.
Temporal distribution of hospital discharges associated with surgical interventions during TW-4, i.e., during the year preceding clinical onset in cases or ID-2 in matched controls: (a) discharges after main surgical procedures (n=20 for cases and n=75 for MCS); and (b) for discharges associated with endoscopies or minor surgical procedures (n=16 for cases and n=16 for MCs). Quarters indicated in calendar time order.
