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20% in lower income settings). It is also higher for mild and moderate than for severe presentations. The lack of financial protection for mental health services is associated with overall increased dropout from care. CONCLUSIONS Extending financial protection and coverage for mental disorders may reduce dropout. Efficiency can be improved by managing the milder clinical presentations at the entry point to the mental health system, providing adequate training, support and specialist supervision for non-specialists, and streamlining referral to psychiatrists for more severe cases.Costa Rica is near malaria elimination. This achievement has followed shifts in malaria health policy. Here, we evaluate the impacts that different health policies have had on malaria transmission in Costa Rica from 1913 to 2018. We identified regime shifts and used regression models to measure the impact of different health policies on malaria transmission in Costa Rica using annual case records. We found that vector control and prophylactic treatments were associated with a 50% malaria case reduction in 1929-1931 compared with 1913-1928. DDT introduction in 1946 was associated with an increase in annual malaria case reduction from 7.6% (1942-1946) to 26.4% (1947-1952). The 2006 introduction of 7-day supervised chloroquine and primaquine treatments was the most effective health policy between 1957 and 2018, reducing annual malaria cases by 98% (2009-2018) when compared with 1957-1968. We also found that effective malaria reduction policies have been sensitive to natural catastrophes and extreme climatic events, both of which have increased malaria transmission in Costa Rica. Currently, outbreaks follow malaria importation into vulnerable areas of Costa Rica. This highlights the need to timely diagnose and treat malaria, while improving living standards, in the affected areas.Objective The present study sought to examine whether beliefs about physical activity as a means of coping with stress predicted college students' exercise levels following naturally occurring stressors. Participants One-hundred and twenty-seven undergraduate students were recruited from psychology courses at a large, urban university in the southwestern United States. Methods Participants completed baseline measures and daily assessments for two weeks; data were analyzed using hierarchical linear modeling. Results Beliefs about the coping properties of physical activity significantly moderated the effects of daily stress (b = 0.19, SE = 0.09, p = .02), and combined daily and chronic stress (b = 0.01, SE = 0.01, p less then .01), on students' daily exercise. Conclusions College students' beliefs about physical activity are associated with changes in their daily exercise following exposure to naturally-occurring stressors. Such beliefs may be amenable to intervention to promote adaptive coping with stress and enhanced physical activity.Background Percutaneous radiofrequency ablation (RFA) is effective in the management of bone tumors. However, knowledge of the complication rate and risk factors for complications of RFA is lacking. Purpose To report the complication rate and risk factors of bone tumor RFA. Materials and Methods This retrospective study reviewed complications in consecutive patients who underwent RFA of primary or metastatic bone tumors from January 2008 to April 2018. Complications were categorized into major (grade 3 or 4, severe or life-threatening) or minor (grade 1 or 2, mild or moderate) according to Common Terminology Criteria for Adverse Events. Univariable and multivariable regression analyses were performed to identify variables associated with complications of RFA. Results A total of 169 patients (median age, 63 years; interquartile range, 55-73 years; 85 men) with 217 tumors were evaluated. The total complication rate was 30.0% (65 of 217; 95% confidence interval [CI] 23.8%, 36.0%). The major complication rate was 2.3% (five of 217; 95% CI 0.8%, 5.3%), with secondary fracture being the most frequent event (1.8% [four of 217]). The minor complication rate was 27.7% (60 of 217; 95% CI 21.7%, 33.6%), with immediate postoperative pain being the most frequent event (18.0% [39 of 217]). Risk factors for all complications included tumor size greater than 3 cm (adjusted odds ratio [AOR], 2.4 [95% CI 1.2, 4.5]; P = .03) and previous radiation therapy (AOR, 3.8 [95% CI 2.0, 7.4]; P = .02). The only risk factor for minor complications was previous radiation therapy (AOR, 2.2 [95% CI 1.0, 4.7]; P = .04). Solutol HS-15 chemical Conclusion Bone tumor radiofrequency ablation is safe, with a low rate of major complications mainly consistent with secondary fractures. Risk factors for complications are tumor size greater than 3 cm and previous radiation therapy. © RSNA, 2020.Background In cystic fibrosis (CF), recurrent imaging and pulmonary function tests (PFTs) are needed for the assessment of lung function during disease management. Purpose To assess the clinical feasibility of pulmonary three-dimensional ultrashort echo time (UTE) MRI at breath holding for quantitative image analysis of ventilation inhomogeneity and hyperinflation in CF compared with PFT. Materials and Methods In this prospective study from May 2018 to June 2019, participants with CF and healthy control participants underwent PFTs and functional lung MRI by using a prototypical single breath-hold three-dimensional UTE sequence. Fractional ventilation (FV) was calculated from acquired data in normal inspiration and normal expiration. FV of each voxel was normalized to the whole lung mean (FVN), and interquartile range of normalized ventilation (IQRN; as a measure of ventilation heterogeneity) was calculated. UTE signal intensity (SI) was assessed in full expiration (SIN, normalized to aortic blood). Obtained mthan in control participants (0.34 ± 0.08 vs 0.39 ± 0.03, respectively; P = .03). Conclusion Three-dimensional ultrashort echo time MRI in the lungs allowed for functional imaging of ventilation inhomogeneity within a few breath holds in patients with cystic fibrosis. © RSNA, 2020 See also the editorial by Wielpütz in this issue.