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More teenage girls have been calling this Shanghai's only accidental pregnancy hotline since the summer vacation started.

"We have seen a 12 percent increase in phone calls, and a 23 percent increase in abortion procedures," Dr Zhang Zhengrong from the 411 Hospital told China Daily.

"Many girls use their summer vacations to deal with these problems."

He added that accidental pregnancies are more likely to happen during the summer.

"Some people will come to us right before the new semester starts," Zhang said.

The 411 Hospital set up its accidental pregnancy hotline for teenagers about two years ago. The hotline has since helped more than 20,000 people, nearly half of them students.

"We have also found an increase in the number of pregnancies involving people who meet through the Internet," Zhang said. "Young girls seem to find it more relaxing and more open talki