The American Red Cross declared a severe emergency blood shortage on Monday and called on people to donate. The humanitarian organization, which says it's the largest supplier of blood products for hospitals and for patient need in the U.S., said the demand from hospitals has outpaced the available supply of blood. Dr. Courtney Lawrence, divisional chief medical officer at American Red Cross, told ABC News that almost one-third of the organization's blood stores across the country have been depleted due to hospital need...