Concentration Inequality for the Negative Binomial Distribution

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I was wondering if there is any well-known concentration inequality for the Negative Binomial distribution with parameters $r$ and $p$. This random variable is defined as the number of independent Bernoulli trials needed to reach $r$ successes, where each trial has probability $p$ of success. The mean of such a random variable is $r/p$, so I am looking for a concentration result for this random variable about $r/p$. Thanks!