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Acknowledgements We thank all researchers and clinicians for their contributions to the field and apologize to those whose work we did not describe or cite

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The three primary phasesanagen, catagen, and telogenwork together to maintain healthy hair coverage across the scalp

doi: 10.1038/s41419-019-2064-5 67 FangYChenXTanQZhouHXuJGuQ

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