Dietitians Act Article 44

The National Dietitian Association shall be organized by at least one third of all special municipality and county (city) dietitian associations.
中文原文 營養師法第44條
營養師公會全國聯合會之設立,應由三分之一以上之直轄市、縣(市)營養師公會完成組織後,始得發起組織。

English translation for reference only; the Chinese text prevails. Not legal advice.