Physical Therapists Act Article 50

The establishment of a national physical therapist association can be initiated after more than one-thirds (1/3) of municipal or county (city) physical therapist associations complete their establishment.
中文原文 物理治療師法第50條
物理治療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)物理治療師公會完成組織後,始得發起組織。

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