Benedict Barboza, the husband of nurse Jacintha Saldanha says he feels like a 'piece of him has been ripped out' following her death.
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Authorities say two family members were previously denied permission to come to the United States.
The trial - which aims to develop a way of using plants to power camera traps and sensors to monitor remote habitats.
A judge ruled the five-year-old girl could be moved from the Royal London Hospital to the Gaslini children's hospital in Genoa.