The 16 articles in this issue draw on the expertise of internationally recognized experts who have collectively provided cross-cutting reviews with a broad perspective on the current state of the field. The authors have provided succinct, up-to-date clinical perspectives and highlight current controversies and future challenges. As a result, this issue is a cutting-edge compendium of this complex and fast-moving field. Throughout the issue, the reader is encouraged to acquire a more comprehensive perspective by drawing connections between earlier and later articles that are thematically grouped around issues dealing with pathogenesis, diagnosis, and therapy. This issue underscores the vital importance of continued support to encourage and nurture collaboration among clinicians and scientists.