Should a doctor accept the invitations of the drug companies?

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Check below answers in case you are looking for other related questions:
There is nothing wrong with accepting a gift and giving something of similar value to the giver
Can a gift not be given away or sold?

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His father gives him money for his university expenses, then there is some extra money left over; is it permissible for him to take it?
There is nothing wrong with accepting a gift and giving something of similar value to the giver
Can a gift not be given away or sold?

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