Predictive value of endometrial thickness, pattern and sub-endometrial blood flows on the day of hCG by 2D doppler in in-vitro fertilization cycles: A prospective clinical study from a tertiary care unitBahadur, Anupama; Mittal, Suneeta; Malhotra, Neena; Bhatt, Ashok; Singh, Neeta · Journal of Human Reproductive Sciences · 2011