Choavaratana, R., Malakorn, K., Thanaboonyawat, I., Petyim, S., Laokirkkiat, P., Saad, N. and Prechapanich, J. 2018. Endometrial Thinning after Ovarian Stimulation using Letrozole or Clomiphene Citrate: A Randomized Trial. Siriraj Medical Journal. 70, 4 (Nov. 2018), 335–342.