Sources:

https://medium.com/history-of-yesterday/when-leprosy-made-her-the-most-reliable-spy-of-world-war-ii-4b3043b95199 - Jhemmylrut Teng

https://www.nationalww2museum.org/war/articles/philippines-spy-joey-guerrero - Lea Schram von Haupt

http://content.time.com/time/subscriber/article/0,33009,798844,00.html

A lot of this info also comes from the book Leper Spy: The Story of an Unlikely Hero of World War II by Ben Montgomery: https://www.indiebound.org/book/9781613734308