Immunogenicity of COVID-19 Vaccination in Immunocompromised Patients (Auto-COVID-VACC): Protocol for Multicenter Prospective Noninterventional Study - Louise Marie Cremer; Ullrich Bethe; Peter Borchmann; Veronica Di Cristanziano; Lutz Gieselmann; Sarah Grimm; Martin Hellmich; Julia Jakobs; Julia A Nacov; Julia M Neuhann; Juergen Prattes; Christoph Scheid; et al. (JMIR Research Protocols)