Physicians Act Article 35
The National Medical Association shall be organized by at least one third of all special municipality and county (city) medical associations.
中文原文 醫師法第35條
醫師公會全國聯合會應由三分之一以上之直轄市、縣（市）醫師公會完成組織後，始得發起組織。
English translation for reference only; the Chinese text prevails. Not legal advice.