“…Of all selected papers, 22 were from the US, 17,24,25,27,28,[31][32][33]36,38,39,[43][44][45][46]49,51,[54][55][56]58,59 5 from Canada, 30,40,52,53,57 4 from Australia, 18,19,26,34 3 from UK, 22,23,48 and 10 from Ireland, Japan, Mexico, Oman, Italy, and Iran. 15,16,20,21,29,35,37,41,42,47,50 A quantitative model had been used in 40 papers to estimate the OB-GYNs requirement, and 5 papers had qualitatively or descriptively investigated the factors affecting the supply and demand of the workforce in this field. The results showed that 28 and 12 papers were related to national and regional studies, respectively.…”