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

[Q]: 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."
[A]: Some people spending excessive time on the internet can show physiological changes similar to drug withdrawal, researchers in Swansea and Milan found.


[Q]: The rally is being held to mark the 25th anniversary of the creation of the Islamist militant movement, Hamas.
There were also reports of clashes between protesters with Israeli soldiers elsewhere in the West Bank.
On Thursday, a Palestinian teenager was shot dead by an Israeli border guard at a checkpoint in Hebron.
Israeli police said he had attacked a guard and threatened him with what turned out to be a metal toy pistol.
Tensions have been running high in Hebron in the past week following repeated clashes between soldiers and stone-throwing youths.
Hebron is home to about 180,000 Palestinians and some 500 Jewish settlers who live in the centre of the city, guarded by Israeli troops.
On Thursday, the Palestinian Authority allowed Hamas to organise a rally in the West Bank for the first time since 2007. Some 5,000 people took to the streets of Nablus to celebrate the group's anniversary.
Hamas and the rival Fatah faction, which dominates the PA, have made conciliatory gestures towards each other since the end of last month's Israeli offensive on Gaza, which Israel said it launched to stop rocket-fire.
"Hamas steadfastness and victory in Gaza was a big victory for all Palestinian people," Amin Makboul, a Fatah leader, said in a speech at Thursday's rally in Nablus.
A rift developed between the two groups after Hamas won legislative elections in 2006 and came to power in Gaza a year later. Repeated attempts at reconciliation have so far failed.
[A]: About 3,000 Palestinians are marching towards an Israeli checkpoint in Hebron, not far from Jewish settlements in the centre of the West Bank city.


[Q]: Don Lock, 79, died after a suspected road-rage confrontation on the A24 near Findon on Thursday evening.
Matthew Daley, 34, of St Elmo Road,  Worthing, who was arrested the next day, is due to appear before Crawley Magistrates' Court on Monday.
He has also been charged with possession of a knife in a public place in connection with the incident.
Mr Lock was attacked after getting out of his car following a "minor collision" with another vehicle. He died from stab wounds.
A knife was recovered following the stabbing.
His family gave a news conference on Saturday to pay tribute to the man they described as "gentle, kind and loving".
Mr Lock's son, Andrew, said the family had been "incredibly overwhelmed" by messages of support and they were "deeply grateful" to the people who had tried to treat his father at the side of the road.
The great-grandfather had recently celebrated his 55th wedding anniversary with his wife Maureen and had also been given the all-clear from cancer.
[A]:
A man has been charged with murdering a great-grandfather who was stabbed after a car crash in West Sussex.


