https://s3.us-east-1.amazonaws.com/libra-easystore-production.lib.virginia.edu/libraetd/2r36tz026/1_Stevens_Jacqueline_2018_PHD.pdf?X-Amz-Algorithm=AWS4-HMAC-SHA256&X-Amz-Checksum-Mode=ENABLED&X-Amz-Credential=AKIAIKM6AN7XWPD7CIUA%2F20260818%2Fus-east-1%2Fs3%2Faws4_request&X-Amz-Date=20260818T195454Z&X-Amz-Expires=3600&X-Amz-SignedHeaders=host&x-id=GetObject&X-Amz-Signature=261b574cdb0737e76fde4cb680ccd2616500c13a7f459e3c579e6a18abf09be1