The company is relatively generous, but that hasn't made its shares popular.We can't say that the healthcare sector is a hotbed of high-yield dividend stocks. Yet there's Walgreens Boots Alliance (WBA 0.92%), with its dividend yield that sits just under 10%. There's a catch here, though -- the pharmacy chain operator's shares have badly under-performed the benchmark S&P 500 index lately, slumping nearly 60% in price since the beginning of this year. So we have to characterize Walgreens stock as high-risk. F ...