For years, Oscar has greeted dawn with the rhythmic swing of his machete as he chops sugar cane in fields near his home in El Salvador. On a typical morning, the 33-year-old begins work long before sunrise in a futile attempt to escape the suffocating heat and humidity. But one morning in December, Oscar clutched his wife’s hand instead of his steel machete. The pair sat in a waiting room of a clinic in the small town of Tierra Blanca. Oscar, a pseudonym being used to protect his privacy, had go...