🐛 Bug Fixes

• Use VirtualStudy service from public VS controller by @forus in https://github.com/cBioPortal/cbioportal/pull/11891

🎨 Style Tweaks

• add survey banner by @inodb in https://github.com/cBioPortal/cbioportal-frontend/pull/5311

🧰 Maintenance

• Update tomcat dependency by @gblaih in https://github.com/cBioPortal/cbioportal/pull/11868

Full Changelog: https://github.com/cBioPortal/cbioportal/compare/v6.4.3...v6.4.4