When I am investigating a topic, I find a couple of articles that I liked and review their references. This helps in locating reputable journals, books, and other studies. It also helps you narrow down your search. I then read those articles and review their references. This helps save time, effort, and frustration. When I was in college I was given access to the ERIC database of journals. You might want to try that website (http://www.eric.ed.gov/).
The following is a list of journals that I was able to find sickle cell anemia referenced in:
The Journal of Clinical Investigation
New England Journal of Medicine
Journal of the American Medical Association
British Journal of Hematology
Journal of Pediatric Hematology/Oncology