How to abbreviate Retention Index?

The ways to abbreviate Retention Index.

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Retention Index(Medicine)
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APASmart Define. (2017). retention index. Retrieved September 23, 2026, from http://smartdefine.org/retention_index/abbreviations/a
ChicagoSmart Define. 2017. "retention index" http://smartdefine.org/retention_index/abbreviations/a (accessed September 23, 2026).
HarvardSmart Define 2017, retention index, Smart Define, viewed 23 September, 2026, <http://smartdefine.org/retention_index/abbreviations/a>.
MLASmart Define. "retention index" 17 November 2017. Web. 23 September 2026. <http://smartdefine.org/retention_index/abbreviations/a>