Add mr.raps paper

Author: remlapmot

vignettes/refs.bib

@@ -83,3 +83,13 @@ @article{hemani-plosgen-2017
     pages = {e1007081},
     number = {11},
 }
+
+@article{zhao2020,
+  title={{Statistical inference in two-sample summary-data Mendelian randomization using robust adjusted profile score}},
+  author={Zhao, Qingyuan and Wang, Jingshu and Hemani, Gibran and Bowden, Jack and Small, Dylan S},
+  year={2020},
+  volume = {48},
+  issue = {3},
+  pages = {1742--1769},
+  url = {https://doi.org/10.1214/19-AOS1866}
+}