Sumber:

– https://www.healthline.com/health/pregnancy/how-to-conceive-twins#ivf
– https://www.medicalnewstoday.com/articles/324455#how-to-increase-the-chance
– https://www.thebump.com/a/how-to-have-twins
– https://www.verywellfamily.com/what-are-my-chances-of-having-twins-1960180