In 1877 he enrolled in the University of Pennsylvania's medical school where he became interested in anatomy, and in 1882, he graduated with the Anomaly Prize from the Demonstrator of Morbid Anatomy. He did his residency at the Episcopal Hospital at Kensington, Pennsylvania. Gynecology wasn't practiced at the hospital, so he opened his own clinic in a two-story house in a working district where he also lived. He saw patients during the day and slept on a sofa at night with a string tied to his toe so that whenever there was a tug on the string, he would be woken up to provide medical assistance. He also made house calls. Later, with money from a group of Philadelphia philanthropist women, he was able to open a formal clinic with an operating room in Norris Square, which later became the Kensington Hospital for Women, the sixth women's hospital in the United States. There, he created the "Kelly stitch", a procedure to treat Stress incontinence, and performed the first successful C-section in Philadelphia. He gained a reputation as an innovator in surgical techniques during this time.

From 1886 to 1888, Kelly traveled to England, Scotland, and Germany to observe abdominal and pelvic surgeons at work. When he was in Leipzig in 1886, he was introduced to the palpation of female ureters by Max Saenger. In Berlin in 1888, he worked with pathologist Rudolf Virchow to determine the best way to catheterize ureters. Then, in Prague in 1888, Czech physician Parel Pawlik showed him how to catheterize ureters using a speculum and how to conduct an air cystoscopy. In 1888, he returned to the University of Pennsylvania, to become an associate professor of obstetrics under the recommendation of William Osler.
Extract the places in the following paragraph. Give them as a numbered list.
1. Kensington, Pennsylvania
2. Philadelphia
3. Norris Square
4. United States
5. England
6. Scotland
7. Germany
8. Leipzig
9. Berlin
10. Prague