The following year, Prince Rangsit Prayursakdi, the Prince of Chainat (son of King Chulalongkorn and adopted son of Queen Savang Vadhana, half-brother of Princess Valaya Alongkorn and Prince Mahidol Adulyadej), director of the Royal Medical College of Siriraj Hospital, selected two doctors and two nurses to further their studies in the United States. These scholarship students were expected to return to teach future generations of medical students and advance the medical profession in Thailand. The medical scholarships were provided by Prince Mahidol Adulyadej, then a first-year student at Harvard Medical School, while the nursing scholarships were provided by his mother, Queen Savang Vadhana. One of the two nurses selected was Sangwan. Her preparations for this trip included a six-month intensive English course with Miss Edna Sarah Cole, headmistress of Kullasatri Wang Lang School for girls (later to become Wattana Wittaya Academy).