SANTIAGO, Chile — Every time the phone rings, Angela Erpel feels her nerves swell. Sometimes it is a scared teenager on the other end, or a desperate mother of three. There are the angry ones, too, with callers playing the sounds of crying babies or sending text messages with pictures of aborted fetuses.

Then Ms. Erpel, 38, a sociologist who volunteers at Chile’s Safe Abortion Hot Line, gathers herself and settles into a familiar dialogue on the use of misoprostol, a drug that will induce a medical abortion.

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