In 1964 the World Medical Association (WMA) took a further step in drawing up the Declaration of Helsinki that called for even clearer standards for doctors participating in biomedical research involving human trials.
1964 年，世界醫學會進一步制訂了「赫爾辛基宣言」，對於醫師參與涉及人體試驗的生物醫學研究，提出了更清楚的規範。