Brief, factual summary in Slovak: The new edition of JAMA contains several important topics: The DECAF study investigated whether the consumption or absence of coffee can reduce the incidence of atrial fibrillation. The LIBERATE-D study investigated whether a conservative dialysis strategy can improve recovery of renal function in patients with acute kidney injury requiring dialysis. A review article evaluated the therapeutic use of cannabis and cannabinoids. Other articles covered topics such as mobile health and smoking, access to abortion, and the impact of changes in co-payments on drug costs. The article does not contain any other topics that are not related to the given title.