Author	Year	Aim of study	Methods	Country	DRIVER CODES	BARRIER CODES
1	Adebayo [51]	2021	To assess the emigration intentions of doctors undergoing residency training in a tertiary healthcare centre in Nigeria and the factors that influence these intentions	Mixed Methods	Africa/Asia	3.1, 1.6, 3.17, 3.4, 1.13, 2.4, 2.1
2	Bailey [59]	2012	To explore the factors influencing the career plans of medical students and recent graduates with regard to four policy-relevant aspects	Qualitative	Africa/Asia	1.12, 1.16, 1.3, 2.10, 2.12, 2.17, 2.5, 2.7, 3.17, 3.18	4.21, 4.22, 6.4, 6.20
3	Bezuidenhout [30]	2009	To investigate the profile of South African qualified physicians who emigrated from South Africa	Quantitative	Africa/Asia	1.5, 3.17	4.10, 4.13,
4	Labonté [61]	2015	To better understand the drivers of skilled health worker migration, its consequences, and the strategies countries have employed to mitigate negative impacts	Mixed Methods	Africa/Asia	1.19, 1.21, 1.25, 1.1, 1.13, 1.14, 1.15, 1.16, 1.5, 1.6, 1.28, 2.18, 2.17, 2.6, 3.17, 3.20, 3.1, 3.16, 3.4	4.17, 4.12, 4.14, 4.3, 4.5, 4.23, 4.26, 4.31, 6.1, 6.2
5	Gureje [29]	2009	To understand the brain drain of health professionals	Mixed methods	Australia	1.1, 1.14, 1.15, 1.5, 1.6, 1.28, 2.24, 2.25, 2.12, 2.13, 2.1, 2.4, 2.9, 3.17, 3.1, 3.5
6	McDermott [44]	2015	To explore the increasing numbers of emergency medicine (EM) registrars that obtained their primary medical degree from UK or Irish universities, who work in emergency departments (ED) throughout Australia and New Zealand	Quantitative	Australia	1.21, 1.16, 1.6, 2.25, 2.14, 3.1	4.21
7	Mara [57]	2020	To analyse the recent trends in the mobility of health professionals in Europe	Mixed Method	Europe	3.17
8	Ramos [47]	2017	To determine the prevalence of migration intentions among Portuguese junior doctors and to identify the most important drivers of career choice for those who are considering migrating in the near future	Quantitative	Europe	1.16, 1.5, 2.20, 3.17
9	Schumann [60]	2019	To explore the driving forces in a group of Egyptian physicians and final-years medical students preparing to migrate to Germany	Qualitative	Europe	1.13, 1.18, 1.3, 1.5, 1.40, 1.45, 2.25, 2.1, 2.7,
10	Ognyanovaa [40]	2012	To shed light on the changes in the scale of movement, trends and directions of flows of health professionals pre and post 2004 and 2007 EU enlargements	Quantitative	Europe	1.1, 1.6, 1.33, 2.1, 3.17, 3.21	4.4, 4.5, 4.21,
11	Wismar [39]	2011	To enhance knowledge on the nature and extent of health professional mobility in the EU, assess its impact on country health systems and outline some major policy strategies to address mobility	Quantitative	Europe	1.20, 1.21, 1.23, 1.25, 1.1, 1.11, 1.12, 1.14, 1.15, 1.16, 1.2, 1.3, 1.4, 1.6, 1.8, 1.9, 1.26, 1.27, 1.31, 1.32, 1.33, 1.38, 1.44, 2.18, 2.19, 2.20, 2.21, 2.24, 2.25, 2.10, 2.12, 2.16, 2.17, 2.1, 2.2, 2.3, 2.4, 2.6, 2.7, 2.8, 2.9, 3.17, 3.21, 3.22, 3.23, 3.24, 3.25, 3.1, 3.11, 3.12, 3.15, 3.2, 3.3, 3.4, 3.5	4.11, 4.21, 4.26, 6.21, 6.22, 6.1, 5.14, 5.15, 5.3
12	Buchan [42]	2014	To assess the scale of mobility of health professionals from the new to the old EU Member States before and after the 2004 and 2007 EU enlargements	Quantitative	Europe	1.20, 1.21, 1.23, 1.25, 1.1, 1.11, 1.12, 1.13, 1.15, 1.16, 1.3, 1.6, 1.8, 1.26, 1.32, 1.38, 1.45, 2.18, 2.19, 2.20, 2.21, 2.25, 2.10, 2.13, 2.17, 2.1, 2.2, 2.3, 2.6, 2.7, 2.8, 3.17, 3.22, 3.24, 3.1, 3.11, 3.12, 3.14, 3.2, 3.3, 3.4, 3.5	4.1, 4.11, 4.21, 4.31, 6.22, 6.1, 6.3, 6.4, 6.18, 5.15, 5.3
13	Bidwell [49]	2012	To explore the extent of increased dependence on international medical migration which has both national and international policy implications (2000–2010)	Quantitative	Ireland	1.2, 2.18	4.9, 4.26, 5.14
14	Humphries [74]	2013	To provide insight into the experiences of non-EU migrant doctors in the Irish health workforce	Qualitative	Ireland	1.12, 1.16, 2.1, 2.6
15	Humphries [52]	2021	To ascertain whether (and how) the COVID‑19 pandemic might disrupt or reinforce existing patterns of doctor emigration	Qualitative	Ireland	2.1, 1.46
16	Wójcicka [28]	2009	To provide a national profile of migration of health professionals in Ireland	Qualitative	Ireland	1.20, 1.21, 1.10, 1.11, 1.14, 1.16, 1.18, 1.3, 1.4, 1.5, 1.32, 1.40, 1.45, 2.1, 2.3, 2.7, 3.17, 3.21, 3.1	4.11, 4.9
17	Begum [58]	2019	To examine how many senior scientists and clinicians were from other countries, particularly from Europe, in two time periods	Quantitative	UK	1.8, 1.30	4.20, 4.21,
18	Blacklock [43]	2012	To investigate the effect of UK policy on medical migration	Quantitative	UK	1.1, 1.30,	4.23
19	Bornat [25]	2011	To examine the push/pull factors and oral histories of overseas trained doctors from South Asia who have entered the UK workforce in geriatric medicine	Qualitative	UK	1.5, 2.3
20	Crossland [56]	2021	To report the numbers of consultant congenital cardiac surgeons and cardiologists who have joined and left UK practice over the last 10 years and explore the reasons for leaving	Quantitative	UK	3.9, 3.17, 2.14, 3.14, 2.1, 2.20, 2.8
21	Davda [20]	2018	To examine the migration motives, the barriers to and facilitators of integration of international dental graduates, compared with nurses and doctors in the United Kingdom	Literature review	UK	1.21, 1.22, 1.24, 1.25, 1.1, 1.11, 1.12, 1.13, 1.15, 1.16, 1.5, 1.7, 1.29, 1.30, 1.45, 2.19, 2.22, 2.10, 2.1, 2.7, 3.1, 3.18, 3.1, 3.2, 3.3, 3.5
22	Gauld [36]	2015	To examine why these doctors go to New Zealand and do not stay for long	Quantitative	UK	1.5, 1.6, 2.14, 2.1, 3.17, 3.1	6.1
23	George [55]	2017	To examine the salaries of selected HRH in India and four popular destination countries (United States of America, United Kingdom, Canada and the United Arab Emirates) while accounting for the in-country cost of living	Quantitative	UK	3.17
24	Herfs [26]	2014	To present data relating to the changes in IMG migration in the UK since the extension of the European Union in May 2004. In addition, data are presented on IMG migration in the Netherlands. These migration flows show that migration patterns differ strongly within these two EU-countries	Quantitative	UK	1.18, 1.5, 1.40, 2.1, 2.4, 3.17, 3.24
25	Hosni [50]	2017	To find out if doctors leaving the UK at the end of the 2 year "International Doctors Training Programme of Obstetrics and Gynaecology" feel that they achieved what they expected to achieve, what went well and what did not go well	Quantitative	UK	2.19, 2.10, 2.1, 3.2
26	Iacobucci [14]	2017	To explore if EU doctors are considering leaving UK	Quantitative	UK	1.30, 1.35, 1.42,
27	Lambert [34]	2017	To report the changes to UK medicine which doctors who have emigrated tell us would increase their likelihood of returning to a career in UK medicine	Quantitative	UK	1.14, 1.15, 1.16, 1.18, 2.20, 2.25, 2.17, 3.17, 3.1, 3.15, 3.4, 3.6	4.21, 5.14
28	Legido-Quigley [27]	2015	To describe the experiences of doctors who decide to move to the UK from other EU member states, exploring their motivations for moving and their experiences of registering and working in the UK	Qualitative	UK	1.13, 1.5, 2.1, 2.4, 3.17, 3.24, 3.12, 3.9	4.1, 4.12, 4.26, 6.22, 5.16
29	Milner [71]	2021	To assess how Brexit relates to doctors’ migration intentions in relation to their feelings that Brexit has impacted their professional life, national identity, and demographic factors	Quantitative	UK	1.35
30	Milner [75]	2021	To provide a detailed examination of European doctors’ feelings towards Brexit, their intentions to leave the UK, and factors that may contribute to their potential decisions to migrate	Quantitative	UK	1.35
31	Quantin [37]	2012	To analyse the migration of doctors between the UK and France, in an attempt to identify the reasons for these migrations	Quantitative	UK	1.16, 1.6, 1.7, 2.18, 2.1, 3.17, 3.2, 3.4, 3.6
32	Sharma [33]	2012	To investigate factors which influenced UK-trained doctors to emigrate to New Zealand and factors which might encourage them to return	Quantitative	UK	1.14, 1.5, 2.12, 2.14, 3.23, 3.1, 3.2, 3.4	4.3,
33	Smith [62]	2012	To conduct an exploratory study to learn about the experiences of GPs who have undertaken international work	Quantitative	UK		6.9, 6.15, 6.17, 6.1, 6.19, 5.14, 5.8
34	Smith [32]	2018	To explore the reasons that doctors choose to leave UK medicine after their foundation year 2 posts	Quantitative	UK	1.19, 1.13, 1.16, 1.6, 1.26, 1.30, 1.32, 2.19, 2.11, 2.13, 2.16, 2.17, 2.1, 2.6, 2.9, 3.1, 3.14,	4.29,
35	Torjesen [54]	2017	To examine the affect of Brexit on EEA doctors intent to continue working in the UK	Quantitative	UK	1.35, 2.17, 3.15
36	Van der Pol [31]	2019	To examine the association between risk attitudes and the migration of UK GPs to Australia	Quantitative	UK	1.5, 2.14
37	Khan [48]	2015	To review and inform the relevant authorities about the barriers faced by IMGs in training and career progression in the UK health service	Literature Review	UK	1.28, 2.19, 2.20, 2.10, 2.1, 2.4, 3.17, 3.1	4.1, 4.26, 6.8, 6.6, 6.19
38	Lambert [34]	2017	To report the reasons why doctors are considering leaving medicine or the UK	Quantitative	UK	1.16, 1.5, 1.6, 2.10, 2.14, 2.1, 3.17, 3.1, 3.11, 3.14, 3.4
39	BMA [38]	2010	To provide information on the careers of doctors, and particularly to: –– identify doctors who leave medicine as a career, or who choose to work in another country and to assess the factors which influence it	Mixed Methods	UK	1.6, 2.19, 2.10, 2.14, 3.1, 3.13, 3.2
40	Young [45]	2010	To scope the main issues and identify gaps in knowledge around two key aspects of health professional mobility/migration – within- UK mobility (i.e. movement between England, Scotland, Wales and Northern Ireland) and mobility to and from the different UK countries and Europe	Mixed Methods	UK	1.23, 1.11, 1.12, 1.15, 1.16, 1.26, 1.32, 1.40, 1.45, 2.18, 2.19, 2.20, 2.21, 2.10, 2.1, 2.2, 2.3, 2.7, 2.8, 3.18, 3.24, 3.1, 3.12, 3.2, 3.3, 3.4, 3.7	6.8, 6.22