McKesson (MCK) is one of the stocks most watched by Zacks.com visitors lately. So, it might be a good idea to review some of the factors that might affect the near-term performance of the stock.Shares of this prescription drug distributor have returned -1.6% over the past month versus the Zacks S&P 500 composite's -0.3% change. The Zacks Medical - Dental Supplies industry, to which McKesson belongs, has lost 1.1% over this period. Now the key question is: Where could the stock be headed in the near term?Whi ...