Can I have access to some other users records?

Hi

I wonder if it is possible to let users access specific records of other users.

Here is a description of the case:

I have created a section that contains data on patients who have an operation in a hospital. Each surgeon logs in to the CMSB with their username/password and inserts data regarding their patients who had an operation. Suppose that Surgeon A logs in to the CMSB with his/her details and inserts the data of Patient X. As Surgeon A has Author privileges for this section, he/she is the only user who can view and edit the details of Patient X. One of the fields of the section, lets the user choose from a drop-down menu the name of another surgeon (Surgeon B) who has assisted in the operation.

My question is whether it is possible to let Surgeon B have access (with view and edit privileges) for Patient X, as does Surgeon A. 

Kind regards, 

Andreas Lazaris