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BQ76940: Zener diodes needed for external cell balancing required?

Part Number: BQ76940

In the EVM reference design http://www.ti.com/lit/ug/slvu925c/slvu925c.pdf on page 45, are the zener diodes D6-D15 really required ? The Pchannel FET does have a back to back zener for protecting the gates. Does the circuit function as effectively and robustly without the diodes D6-D15 ?