They may have a link of convenience - they may find it tactically convenient to cooperate from time to time.
For example, a television that is reviewed by Consumer Reports would have a link to BillShrink analysis of television (cable or satellite) service.
In fact, it is likely that only a small proportion of hereditary cancers have a link to the BRCA gene, so a negative result could never rule out even hereditary breast cancer.
In 73% of cases, the rules state that pensions in payment have a link to RPI, with just 10% using whatever the government's preferred measure might be, and 17% have some other sort of measure altogether.
AIDS. In 1995, the pill was thought to have a possible link with thrombosis, a threat largely discounted by the World Health Organisation.
The research is the latest of a number of studies that have made a link between infections and cancer.
Instead, they have a modest link northwards into the greater European market thanks to a few pipelines through the Pyrenees.
No Algerian officials have suggested a link between the strike and the attack, nor have they singled out the drivers.
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Independent studies have shown a link between obesity and proximity and consumption of fast foods.
Previous studies have suggested a link between working night-shifts and both heart disease and breast cancer.
Previous studies have shown a link between repeated lung infections with RSV and developing asthma later in life.
Some studies have noted a link between the disease and carpet cleaning chemicals.
Researchers at Western Illinois University have found a link between narcissism and the number of Facebook friends one has.
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It may have been subconscious, but these women were getting together because they knew they would have a social link.
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This is the first time that researchers have found a link between the FTO gene and a disease which is not linked to obesity and BMI.
"We already have a functional link running in the lab, and we are aggressively moving to higher bandwidths, " said Mario Paniccia, director of Intel's Photonics Technology Lab.
Ashley Johnson, assistant secretary of Bean Residents' Association, said the group would have liked to have seen a link between the opening of the extension and road works.
Earlier studies have suggested a link between healing and stress.
Two studies published in the Journal of the American Medical Association - on football in the UK and the US - have found a link between multiple concussions and neuropsychological problems.
The "cells" have a chain-link fence perimeter, a concrete floor and a wooden roof but are otherwise open to the elements.
Studies, like a 2007 report prepared by Art Durnev and Amrita Nain of McGill University, have also shown a link between increased enforcement of insider trading laws and decreased exchanges of confidential information across a vast spectrum of countries.
They have previously shown a link between autism and living close to major roads.
However, detectives have ruled out a link with the disappearance of two other Middlesbrough women.
In most European countries, except secular France, Christian churches have inherited a privileged link with the state.
The same team of researchers have previously reported a link between people prone to insomnia and heart attacks.
BBC: Poor sleep linked to heart failure, Norwegian study says
While scientists have discovered a genetic link to depression, others are also looking into brain chemistry for clues to depression.
Users wanting to connect via a mobile service will have to link their tablets to a BlackBerry device and connect through that.
"To date, these studies have not identified a link between exposure to the historically impacted water at Camp Lejeune and adverse health effects, " the service said.
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