https://reader.elsevier.com/reader/sd/pii/S1364032118308153?token=901FC2FA794F967D685D91C6FC100D95C0181DFABC81DE05BF01515E3635BC80FBE967B13D70A4E436968E25B9AADDFD [This article may be of interest. Lots of photos, and opinions from experts.]