Panutte, Wikanda, Nattaya Sae-ung, and Yupin Aniwat-angkoorn. “The Preparation of Standard Samples for Interlaboratory Proficiency Testing of HCG Pregnancy Test Kit in Medical Network”. Archives of Allied Health Sciences 30, no. 3 (December 29, 2018): 289–299. Accessed April 29, 2024. https://he01.tci-thaijo.org/index.php/ams/article/view/163943.