This continuing series gathers and presents original research results on the leading edge of medicine and biology. Each article has been carefully selected in an attempt to present substantial topical data across a broad spectrum. Topics discussed include the diagnosis and therapy of periodontal disease; cancer complicating pregnancies; prevention of pediatric obesity; the role of B cells in auto-immune disease; defining and clarifying sexual health; hepatopulmonary syndrome; aquatic therapy in knee surgery patients and long-term health outcomes in prisoners of war.