The Declaration of Helsinki outlines ethical principles for doctors conducting clinical research involving human subjects. It states that a doctor's primary duty is to their patient's health according to the Declaration of Geneva. Any research on humans must be intended to help suffering people and further scientific knowledge. Doctors must follow the standards outlined as well as laws in their own countries when conducting clinical research. The document makes a distinction between research aimed at therapy for a patient and research aimed purely at scientific knowledge without therapeutic benefit to the subject.