Question: What is this disease related to abnormality in the oxygen-carrying protein haemoglobin that Chukwuedu Nwokolo is carrying out research on?
Sentence (from "Sickle-cell disease"): A number of health problems may develop, such as attacks of pain ("sickle-cell crisis"), anemia, swelling in the hands and feet, bacterial infections, and stroke.
Relevant evidence: No