Dementia(2) COVID-19(2) clinical trial(1) Enrollment barriers(1) herpesvirus(1) subjective cognitive decline(1) Preclinical(1) Infection(1) Alzheimer’s disease(1) Mortality(1) MCI(1) Amyloid PET(1) Alzheimer’s disease(1) Cognitive decline(1) recruitment(1) Antipsychotics(1) mendelian randomization(1) lockdown(1)