Table 1. Acknowledgements categories of previous studies.

(A1) Acknowledgements categories of different scholars		(A2) Acknowledgements categories of previous studies in conclusion
Mackintosh [23]	1. Facilities 2. Access to data 3. Help of individuals	1. Access support relates to access to research information and infrastructure facilities (Access to data, Access to research-related information, Access to unpublished data, and Access) 2. Peer interactive communication (PIC) support relates to people who provided related research advice, valuable suggestions, intellectual guidance, critical reviews, comments, discussions, and assessments (Conceptual, Theoretical support, and Trusted assessor) 3. Moral support relates to those who encouraged and supported access to facilities, those who gave permissions, and dedication from family or friends (Help of individuals and Prime mover) 4. Technical support relates to help in technical expertise, technology, laboratory equipment and sample preparation, programming and experimental techniques, and study and analysis design (Technical, Technical expertise, Instrumental/technical, and Technical assistance) 5. Clerical support relates to secretarial services from colleagues such as routine data acquisition and management (Dogsbody) 6. Financial support relates to grants/scholarships from external or internal funding sources (Paymaster and Financial) 7. Manuscript and editorial support relates to help preparing a manuscript, editing, proofreading, language translating, critical reviews, and comments (Manuscript preparation and Editorial/linguistic support) 8. Unclassifiable relates to those types that cannot be classified according to the categories above.
Patel [24]	1. Technical assistance 2. Theoretical support
McCain [9]	1. Access to research-related information 2. Access to unpublished data 2. Peer interactive communication 4. Technical assistance 5. Manuscript preparation
Cronin [8]	1. Paymaster 2. Moral support 3. Dogsbody 4. Technical 5. Prime mover 6. Trusted assessor
Tiew and Sen [20]	1. Moral support 2. Financial support 3. Access 4. Clerical support 5. Technical support 6. Peer interactive communication 7. Unclassifiable
Cronin, Shaw, And LaBarre [25–26]	1. Conceptual 2. Editorial 3. Financial 4. Instrumental/technical 5. Technical expertise 6. Moral 7. Unknown
Rattan [21]	1. Access support 2. Moral support 3. Financial support 4. Technical support 5. Peer interactive communication support 6. Clerical support 7. Editorial/linguistic support 8. Unclassifiable