Chris Johnson

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Of the seven sea turtle species, the critically endangered leatherback sea turtle (Dermochelys coriacea) exhibits the lowest and most variable nest success (i.e., hatching success and emergence success) for reasons that remain largely unknown. In an attempt to identify or rule out causes of low reproductive success in this species, we established the(More)
BACKGROUND Perioperative respiratory adverse events in children are one of the major causes of morbidity and mortality during paediatric anaesthesia. We aimed to identify associations between family history, anaesthesia management, and occurrence of perioperative respiratory adverse events. METHODS We prospectively included all children who had general(More)
In this paper, we report on an ITiCSE-13 Working Group that developed a set of 654 multiple-choice questions on CS1 and CS2 topics, the Canterbury QuestionBank. We describe the questions, the metadata we investigated, and some preliminary investigations of possible research uses of the QuestionBank. The QuestionBank is publicly available as a repository for(More)
With the rise of social networks like Facebook and Twitter, it might seem that our opportunity to communicate with others is limited only by our access to smart phones and computers. However, most social networks are not designed with complete accessibility in mind. In particular, these networks' chronological organization of news items, abundant feature(More)
Executive Summary: This overview provides a brief summary of causal analysis techniques that can be used to analyse mishaps involving Electrical, Electronic or Programmable, Electronic Systems (E/E/PES). The intention is not to provide a complete introduction. Detailed guidance on each technique is available for the references at the end of this document.(More)
BACKGROUND Human babesiosis, caused by intraerythrocytic protozoan parasites, can be an asymptomatic or mild-to-severe disease that may be fatal. The study objective was to assess babesiosis occurrence among the U.S. elderly Medicare beneficiaries, ages 65 and older, during 2006-2013. METHODS Our retrospective claims-based study utilized large Medicare(More)
BACKGROUND Aortic stenosis (AS) is a common valve problem that causes significant morbidity and mortality. The goal of this study was to determine whether an emergency physician (EP) could determine severe AS by reviewing only two B-mode echocardiographic views (parasternal long axis (PSLA) and parasternal short axis (PSSA)) obtained by trained(More)