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If you are a regular PubMed user, a personal NCBI account is highly recommended.
The National Center for Biotechnology Information NCBI will change the login option to NCBI personal accounts beginning June 1, 2021. In the future, NCBI will no longer manage login credentials.
Therefore, all existing NCBI accounts must be linked to a third-party account (e.g., Google, Microsoft, Facebook, or ORCID account) before June 1, 2021. You may also choose to link the NCBI account to the UZH account (via SWITCHaai):
go to your account settings and choose linked accounts 
search for zurich and select 
successful linking
Affiliates of the University Hospital Zurich will also have the option to link the NCBI account to the USZ account (via SWITCHaai). However, this option is still in process and unfortunately not available at the moment. Therefore, all USZ employees should link their existing NCBI account to a third-party account, at least temporarily, so that personal data (saved searches, saved collections, personal filters, etc.) are not lost.
Several third-party accounts can be linked and these can also be unlinked at any time (1 linked account should remain).