Health Psychology Peer Review,

 Although its early beginnings can be traced to the field of clinical psychology,[3] four different divisions within health psychology and one related field, occupational health psychology (OHP),[4] have developed over time. The four divisions include clinical health psychology, public health psychology, community health psychology, and critical health psychology.[5] Professional organizations for the field of health psychology include Division 38 of the American Psychological Association (APA),[6] the Division of Health Psychology of the British Psychological Society (BPS),[7] the European Health Psychology Society,[8] and the College of Health Psychologists of the Australian Psychological Society (APS).[9] Advanced credentialing in the US as a clinical health psychologist is provided through the American Board of Professional Psychology. By understanding psychological factors that influence health, and constructively applying that knowledge, health psychologists can improve health by working directly with individual patients or indirectly in large-scale public health programs. In addition, health psychologists can help train other healthcare professionals