Extreme loneliness is a risk factor for X.
X and Y are important driving factors of Z.
X is almost as strong a risk factor for disability as Y.
X is generally seen as a factor strongly related to Y.
The mixing of X and Y exerts a powerful effect upon Z through …
Due to X and Y, inflowing surface water becomes more dense as it …
Loneliness can have profound health consequences for older people.
As a consequence of X, it appears that Y alone is not the causative factor of …
The study found that loneliness has twice the impact on early death as obesity does.
Possible cause and effect relationships expressed tentatively.
There is some evidence that X may affect Y.
It is not yet clear whether X is made worse by Y.
This suggests a weak link may exist between X and Y.
The use of X may be linked to behavior problems in …
The human papilloma virus is linked to most cervical cancer.
The findings indicate that regular exercise could improve cognitive function in people at risk of …
X may have been an important factor in …
X may have contributed to the increase in …
X may have played a vital role in bringing about …
X may have been caused by an increase in …
In the literature, X has been associated with Y.
X in many cases may be associated with certain bacterial infections.
A high consumption of X could be associated with infertility.