* Some health workers, authorities stick to five * Shortages of specialist needles an issue * UK, Denmark, Netherlands succeed in stretching supply (Adds comment from Swiss canton in final two paragraphs) ZURICH/PARIS, Jan 19 (Reuters) - Some European countries are drawing fewer than the approved six doses from Pfizer and BioNTech’s COVID-19 vaccine vials, meaning shots are likely going to waste even as nations plead for more. Officials and healthcare professionals in France, Germany and Switzerland all pointed to yields short of six doses, adding to frustrations in countries already laggin...