What statement identifies the main problem addressed in the research by Nelissen et al. (2017)?

The statement that effectively identifies the main problem addressed in the research by Nelissen et al. (2017) is the one noting that postpartum hemorrhage is a major cause of maternal mortality. This statement establishes the critical context for the research, highlighting the severity of the issue at hand. By identifying postpartum hemorrhage as a leading cause of maternal deaths, the study sets the stage for the subsequent research objectives and implications, making it clear why the research is necessary and urgent.

In contrast, while the improvement in clinical performance of healthcare workers is a relevant topic, it does not encapsulate the core problem of maternal mortality linked to postpartum hemorrhage. Similarly, assessing the effect of training or noting the incidence rate provide insights into specific aspects of the study but do not frame the overarching issue that prompted the research in the first place. The primary focus of the research is to address the significant health crisis posed by postpartum hemorrhage, making the correct statement crucial for understanding the study's importance.