What is the fine-grained topic of the following text: During Phase I, RBM, and Children's Memorial Hospital (CMH) propose to utilize this quantitative proteomics approach to compare the protein profiles in urine samples obtained from patients diagnosed with PH1 vs. age- and gender-matched control populations. Only return the topic.
Comparing protein profiles in urine samples of PH1 diagnosed patients and control populations using quantitative proteomics approach in a study by RBM and Children's Memorial Hospital.