Publisher's note

摘要

For years, academic articles have been published in a similar layout - a format which starts with an abstract and ends with a conclusion and a list of references. Articles were presented in this way with the reader of the printed version in mind. However as most researchers now access articles online, readership styles and how information is gathered have changed quite considerably. In order to enhance the online article, and to adapt to the needs of our community, we are introducing two new features -graphical