RecruitingPhase 2Drug trialA Study to Investigate the Efficacy, Safety, Tolerability and Pharmacokinetics of PKN605 in Participants With Atrial FibrillationA randomized, placebo-controlled, participant-and investigator-blinded study to evaluate the efficacy in reducing atrial fibrillation burden as well as the safety, tolerability and pharmacokinetics of PKN605 in participants with atrial fibrillation