Antifungal Agents/administration & dosage; Drug Industry/economics; Drug Industry/methods; Foot Dermatoses/drug therapy; Onychomycosis/drug therapy; Administration, Oral; Administration, Topical; Anti-Infective Agents, Local/administration & dosage; Anti-Infective Agents, Local/adverse effects; Anti-Infective Agents, Local/economics; Antifungal Agents/adverse effects; Antifungal Agents/economics; Drug Approval; Drug Industry/legislation & jurisprudence; Drug Industry/trends; Drug Resistance, Fungal/physiology; Foot Dermatoses/economics; Foot Dermatoses/epidemiology; Humans; Laser Therapy/economics; Naphthalenes/administration & dosage; Naphthalenes/adverse effects; Naphthalenes/economics; Onychomycosis/economics; Onychomycosis/epidemiology; Terbinafine; Treatment Outcome; United States