Global Anti-Obesity Drugs Market Assessment, By Mechanism of Action [Centrally Acting Drugs, Peripheral Acting Drugs], By Target [GLP-1, Amylin, Ghrelin, Others], By Type [Prescription Drugs, OTC Drugs], By Distribution Channel [Hospital Pharmacies, Retail Pharmacies and Drug Stores, Online Pharmacies], By Region, Opportunities and Forecast, 2018-2032F