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By Julie Steenhuysen CHICAGO (Reuters) - At Roberto Santos General Hospital in Salvador, Brazil, Dr. Antonio Almeida and a team of specialists are closely following two groups of women: Those who deliver babies with abnormally small heads and those who deliver apparently normal babies. The hospital is one of three in this city on Brazil’s eastern coast where investigators are studying the most urgent question of the Zika outbreak: Is the virus causing a spike in birth defects, and, if so, how great is the risk? The answer will help shape the response to the rapid spread of Zika throughout the Americas. Concerns over the potential link to microcephaly have prompted a U.S. alert advising pregnant women against travel to 31 countries and territories with outbreaks.