Versions of Nebraska Statutes 38-3013. Physician assistants; services performed; collaborative agreement; supervision; requirements on LawServer 2023 Nebraska Statutes 38-3013. Physician assistants; services performed; collaborative agreement; supervision; requirements 2022 Nebraska Statutes 38-3013. Physician assistants; services performed; collaborative agreement; supervision; requirements 2021 Nebraska Statutes 38-3013. Physician assistants; services performed; collaborative agreement; supervision; requirements