1, the signatures are all signed by higher-level doctors, indicating that higher-level doctors approve the medical behavior of lower-level doctors or are taught by them. This is no problem. Large hospitals are often teaching hospitals, and many interns and doctors do not have the right to sign.
The signature is signed by a doctor at a lower level, which is not allowed. The principle is that everyone is only allowed to sign their own names, doctors and patients alike. A junior doctor should not sign the name of a superior doctor without permission.