In this task, you are given an article. Your task is to summarize the article in a sentence.

Both heart rate and blood pressure increased in those who admitted extended time online - along with reported anxiety levels.
There was no such changes for those with no internet-usage problems.
Scientists said it suggested internet addiction is a real physical condition for some people.
The results of the study, which involved 144 participants aged 18 to 33, are published in the journal PLOS ONE.
Study participants had their heart rate and blood pressure measured before and after a brief internet session.
Their anxiety and self-reported internet-addiction were also assessed.
The results showed increases in physiological arousal on ending the internet session for those with problematically-high internet usage.
It follows a study by the two universities in 2013 which showed internet addicts can suffer a form of cold turkey when they stop using the web.
Prof Phil Reed, of Swansea University, said: "We have known for some time that people who are over-dependent on digital devices report feelings of anxiety when they are stopped from using them, but now we can see that these psychological effects are accompanied by actual physiological changes."
Prof Reed, who led the study, said there was an average 3-4% increase in heart rate and blood pressure, and in some cases double that figure, immediately on ending internet use, compared with before use, for those with digital-behaviour problems.
Although this increase is not enough to be life-threatening, the study said, such changes can be associated with feelings of anxiety, and with alterations to the hormonal system that can reduce immune responses.
The study also suggested these physiological changes and accompanying increases in anxiety indicate a state like withdrawal seen for many "sedative" drugs, such as alcohol, cannabis, and heroin.
Prof Roberto Truzoli, of Milan University, a co-author of the study, said: "Whether problematic internet use turns out to be an addiction - involving physiological and psychological withdrawal effects - or whether compulsions are involved that do not necessitate such withdrawal effects - is yet to be seen, but these results seem to show that, for some people, it is likely to be an addiction."
Some people spending excessive time on the internet can show physiological changes similar to drug withdrawal, researchers in Swansea and Milan found.

A community trust has been leasing Theatr Gwaun in Fishguard from Pembrokeshire council for five years.
The venue has run as a theatre and cinema since 1994, but it closed in 2011 when the council ended its funding after it made losses of Â£60,000 a year.
Chairman of the Theatr Gwaun Community Trust, Richard Goswell, said it was a "giant step" for the arts in the town.
The transfer is the first to be made under the council's Community Asset Transfer Policy and Mr Goswell said it would allow the group to access a range of funding.
A campaign to reopen the theatre was backed by Hollywood actors Beau Bridges and Sally Field.
A deal has been done to transfer the ownership of a Pembrokeshire theatre.

It was the suddenness and swiftness of it, the devastating loss of life and the heroics.
Exactly one year ago, Buncrana in County Donegal became the focus of international media attention after a car rolled into Lough Swilly from the slipway.
The six people in the car had simply stopped to watch the sunset - which is renowned in that part of the world - but the car slipped on algae which had built up over the winter.
Francis Crawford, who raised the alarm, says his recollections are as "vivid" as the night it happened.
"It was like 9/11 that night - with the fire service, the lifeboat, the guards, the ambulances, the helicopter above," he said.
"It was a recovery mission when the services arrived. The car had gone, the people were gone. You cannot go there. If you start to think about it, you try to put it to the side and say a prayer for the people."
He recalled speaking to Sean McGrotty through an open window as the car was going in. The 49-year-old died alongside a woman and three children.
The relationship between them is best explained through Londonderry woman Louise James, who was in England at the time of the accident - she lost her partner Mr McGrotty, their two sons Mark, 12, and Evan, eight.
The woman was her mum Ruth Daniels, 57, and the other child was her sister Jodie Lee Daniels, 14.
But the sixth occupant of the car survived - Mr McGrotty managed to pass their four-month-old daughter, Rionaghac-Ann, through the window to passer-by Davitt Walsh who stripped off and ran into the freezing water.
Mr Crawford, who was visiting the pier with his wife, Kay, said it had been a difficult year and his heart was still "sore" and full of "great sadness".
He said he had received "great attention from the medical profession, counselling, the local church" and it was an "ongoing process".
He heaped praise on the emergency services and the dignity of Ms James, who he described as a "real hero".
"How she is coping is a wonder to everyone and a great example of how in the face of the greatest adversity, you can survive," he said.
John McCarter, RNLI lifeboat operations manager for Lough Swilly, said his first recollection of the "freak accident" was the pagers going off after 18:00 GMT - the crews had been out on an exercise all day and had just got home.
"As it very quickly unfolded, there was a major disaster happening at the pier," he said. "Virtually all our crew came out at very short notice and started to get into the process of some kind of rescue."
He said Buncrana pier was their "home" and the crews were "dumbfounded" by what had happened on their doorstep.
The emergency services, the whole community "felt it personally", he added.
The young victims are being remembered by friends and pupils on this first anniversary of their deaths.
Students at St Mary's College, where Jodie-Lee was a pupil, held a mass and placed hearts on a tree.
Ellen Glackin said she was still processing the fact she had "really gone", while Megan Grant said the year group had pulled together.
"We know that Jodie would not want us to be thinking about it all the time," she said. "She was beautiful and happy, and was the type of girl who would make you smile at any time".

There are some tragedies that really stick in the mind and the Buncrana pier tragedy is one of them.

