Dr RS and Dr DJ contributed in the designing of the methodology including the design of the research instruments.
Dr MAM contributed in the proposal development and manuscript write up.
Dr Tutu said he contributed "in a small way to the development of our new democratic, exhilarating, exasperating nation.
AA, JMM, SDS, DR, JMB, PH, PS, PT, MT, IL contributed in the preparation and revision of the present manuscript.
DR: contributed to prepare the study and write the manuscript.
DR contributed to the study design, interpretation of the results, and revision of the manuscript.
DR contributed to the design, and commented on the manuscript.
AJDB, AW and DR-D approved the search strategy, revised the text and contributed in the planning of the review.
Dr. Nergis provide access to the METU technology park and contributed in the literature review.
At last, Dr. Sergio Perez-Holanda, MD, PhD, has contributed in the conception of the study, so as in the collection, analysis and interpretation of data, team's coordination, and has written and draft the manuscript.
