Telapol, K., Bumrungphuet, S. and Israngura Na Ayudhya, N. 2018. Effect of Ethyl Chloride Spray for Pain Reduction during Amniocentesis: A non – blinded randomized controlled trial. Thai Journal of Obstetrics and Gynaecology. 26, 2 (Jun. 2018), 75–82. DOI:https://doi.org/10.14456/tjog.2018.10.