In an undated handout photo, Dr. Russell E. Ware meets a young patient in Uganda. Sickle-cell disease is common in Africa, and a drug that protects children in wealthy countries has been proven safe for use around the world. (Handout via The New York Times) -- NO SALES; FOR EDITORIAL USE ONLY WITH NYT STORY SLUGGED SCI SICKLE CELL DRUG BY DONALD G. MCNEIL JR. FOR TUESDAY, DEC. 4, 2018. ALL OTHER USE PROHIBITED. --..