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French says the way influencer stressors co-occur with other stressors is similar to the way humans experience co-morbidities, such as when someone is diagnosed with heart disease.

Previous studies have demonstrated that wildfires and extreme heat co-occur with great frequency, and that people’s physiological responses to the hazards are related, he said.

Red deer density is only reduced when wolves, lynx and bears co-occur at the same site.

These sleep spindles often co-occur with slow-wave sleep, a particular frequency of slowly oscillating EEG activity.

It extracts hashtags, links, accounts and other features that co-occur in tweets about topics a user wishes to study.