Department of Medicine, Karolinska Institutet, Solna, Sweden; Stockholm Health Care Services, Stockholm County Council, Sweden; Department of Clinical Neuroscience, Neuro, Karolinska Institutet, Stockholm, Sweden. Electronic address: maria.lalouni@ki.se. Department of Behavioral Sciences and Learning, Linköping University, Sweden; Center for Health and Medical Psychology, Örebro University, Sweden. Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, Stockholm, Sweden; Department of Clinical Neuroscience, Centre for Psychiatry Research, Karolinska Institutet, Stockholm, Sweden. Department of Clinical Neuroscience, Division of Psychology, Karolinska Institutet, Sweden; Department of Clinical Neuroscience, Osher Center for Integrative Medicine, Karolinska Institutet, Sweden. Stockholm Health Care Services, Stockholm County Council, Sweden; Department of Clinical Neuroscience, Centre for Psychiatry Research, Karolinska Institutet, Stockholm, Sweden. Department of Medicine, Karolinska Institutet, Solna, Sweden; Department of Paediatric Gastroenterology and Nutrition, Sachs' Children's Hospital, Stockholm, Sweden. Department of Clinical Neuroscience, Centre for Psychiatry Research, Karolinska Institutet, Stockholm, Sweden; Department of Clinical Neuroscience, Division of Psychology, Karolinska Institutet, Sweden.