>Passengers in planes stacked up over a congested airport may find the experience nervousmaking, but travelers only rarely have to endure that kind of tension. For air traffic controllers on the ground, facing the possibility of causing a calamity each working day, the stress is unremitting and the effects on the digestive system horrendous. A study by the newly formed Academy of Air Traffic Control Medicine in St. Charles, 111., shows that ulcers are distressingly commonplace among control-tower personnel. The annual incidence in American physicians, for example, is between 2.5% and 4%...
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