Fellowships look to be popular according to this study from Australia published in 2015:
Some excerpts...
"Nearly half of trainee respondents would have reconsidered their choice of specialty had they known about the possible oversupply in the workforce with 12.4% undecided about continuing their career in radiation oncology."
"Three-quarters of respondents indicated that they planned on undertaking a fellowship year after training (72.3%, n = 73) and 24 (23.8%) were undecided. Those aged less than 30 years were more likely than their older colleagues to be planning a fellowship year (P = 0.045). The majority of respondents who reported that they were planning a fellowship year were doing so to either be more competitive in the job market (94.5%, n = 69) or to gain specific skills and expertise (94.5%, n = 69)."
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