Geometric classification of scalp hair for valid drug testing, 6 more reliable than 8 hair curl groups

• K. Mkentane,

  Affiliations Hair and Skin Research Lab, Division of Dermatology, Groote Schuur Hospital, Cape Town, South Africa, Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa

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• J. C. Van Wyk ,

  Contributed equally to this work with: J. C. Van Wyk, N. Sishi

  Affiliation Hair and Skin Research Lab, Division of Dermatology, Groote Schuur Hospital, Cape Town, South Africa

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• N. Sishi ,

  Contributed equally to this work with: J. C. Van Wyk, N. Sishi

  Affiliation Hair and Skin Research Lab, Division of Dermatology, Groote Schuur Hospital, Cape Town, South Africa

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• F. Gumedze,

  Affiliation Statistical Sciences, Faculty of Science, University of Cape Town, Cape Town, South Africa

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• M. Ngoepe ,

  ¶‡ These authors also contributed equally to this work.

  Affiliation Engineering, University of Cape Town, Cape Town, South Africa

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• L. M. Davids ,

  ¶‡ These authors also contributed equally to this work.

  Affiliation Department of Human Biology, Faculty of Health Sciences, University of Cape Town, Cape Town, South Africa

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• N. P. Khumalo

  * E-mail: n.khumalo@uct.ac.za

  Affiliation Hair and Skin Research Lab, Division of Dermatology, Groote Schuur Hospital, Cape Town, South Africa

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