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.
Patient attrition from raw data to study population (cohort 1) and reference (cohort 2). DRG, dorsal root ganglion stimulation; NPR, National Patient Registry in Sweden; ONS, occipital nerve stimulation; PNFS, peripheral nerve field stimulation; RAY, a local registry on invasive neurostimulation treatments for pain.
