The rearfoot medially-wedged insole was a useful intervention for preventing or reducing painful knee or foot symptoms during running in runners with pronated foot.

In the current era of big data, a huge amount of data has been generated and collected from a wide variety of rich data sources. Embedded in these big data are useful information and valuable knowledge. An example is healthcare and epidemiological data such as data related to patients who suffered from epidemic diseases like the coronavirus disease 2019 (COVID-19). Knowledge discovered from these epidemiological data helps researchers, epidemiologists and policy makers to get a better understanding of the disease, which may inspire them to come up ways to detect, control and combat the disease. As "a picture is worth a thousand words", having methods to visualize and visually analyze these big data makes it easily to comprehend the data and the discovered knowledge. In this paper, we present a big data visualization and visual analytics tool for visualizing and analyzing COVID-19 epidemiological data. The tool helps users to get a better understanding of information about the confirmed cases of COVID-19. Although this tool is designed for visualization and visual analytics of epidemiological data, it is applicable to visualization and visual analytics of big data from many other real-life applications and services.

Background: The present study aimed to investigate the current situation and future trends of online academic activities for oncologists during the coronavirus disease 2019 (COVID-19) pandemic.Methods: From April 22 to May 5, 2020, a multicenter survey was conducted using an online questionnaire platform. To compare categorical variables, χ 2 -test, the kappa consistency analysis, and Wilcoxon rank sum test were applied. For all statistical hypotheses, P<0.05 was considered significant.Results: In the present study, 2,120 oncologists participated in the survey. Of these, 2,035 respondents participated in online academic activities. During the pandemic, online academic activities significantly increased [oncologists who participated in online academic activities ≥60%: 64.58% (during the pandemic) vs. 10.90% (before the pandemic), Cohen's kappa coefficient =0.0499, P<0.001]. The findings indicated that 90.6% of respondents considered that the online academic activities would become a future trend.The main reason for the increase in online academic activities was due to in-person academic conferences and diagnoses/treatment being affected by the pandemic. Both speakers/chairs and audiences agreed that online academic activities resulted in reduced stress (61.15% vs. 67.26%, respectively; χ 2 =7.009, P=0.03).In the present study, 62.21% of audiences considered that the recording function of online activities was very important (score 5), while only 53.86% of the speakers had the same opinion (Z=-3.5340, P<0.001).Compared with provincial capital cities and other cities, the participants from first-tier cities thought that online academic activities required significant physical energy (χ 2 =6.41, P=0.040), and were more reluctant for the playback of activity contents (χ 2 =9.33, P=0.002) and the screenshot of activity contents (χ 2 =41.99, P<0.001).Conclusions: During the COVID-19 pandemic, online academic activities have become the main form of academic exchanges for oncologists. Taking full advantage of online academic activities and paying adequate attention to the participants' requirements with different roles and titles, and from different cities, are key to

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