However, non-randomised studies might not yield valid conclusions, leading to large residual uncertainty about how to interpret the results, and can also waste scarce intervention-related resources, making them profoundly unethical.
If neurofeedback proves to be effective for pediatric brain tumor survivors, this can be a valuable addition to the scarce interventions available to improve neurocognitive and psychosocial functioning.
In settings with weak or non-existent vital registration systems and where records of population numbers, uptake of services or exposure to interventions are scarce, estimating intervention coverage demands creative use of primary and secondary data sources.
In addition, since studies reporting on the cost-effectiveness of stress-management interventions by means of cost-utility analysis (CUA) are scarce, the interventions in the stepped-care approach will be evaluated using CUA.
To achieve a just allocation of scarce medical interventions, society must embrace the challenge of implementing a coherent multiprinciple framework rather than relying on simple principles or retreating to the status quo.
In low-resource settings, paediatric facilities for the management of meconium aspiration syndrome are scarce and interventions to prevent meconium aspiration are needed.
Although research is scarce, walking interventions have been successfully implemented in the work setting [ 6], and also among previously sedentary employees [ 7].
However, supporting interventions for this group are scarce and existing interventions bear several limitations.
The Rev. Scott Denman, the Rector of Oakland's St. John's Episcopal Church noted that without the President's intervention scarce transportation dollars would have been "taken away from those who have trouble affording bus tickets and given to those who have no trouble affording airline tickets".
Although hard scientific evidence on the outcomes of these programmes is scarce, the available intervention research shows potential for reducing symptoms of psychosocial distress in former child soldiers.
Research on this topic is scarce, and most interventions used today are drawn from research on younger and middle-age adults.
