Time period is set incorrectly
You can only get 30 days of history on this type of hashtag (conference, disease, other).
And you can only analyze the last 30 days. Only Patient and Community Tweet Chats are supported for free by Symplur without such limits.
Access over 4,000 #ATSISPC18 tweets by signing up for Symplur Signals Professional.
Symplur has over 4,000 #ATSISPC18 tweets going back to November 2018.
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