Impact of Psychosocial and Palliative Care Training on Nurses’ Competences and Care of Patients With Cancer in Cameroon: Protocol for Quasi-Experimental Study - Nahyeni Bassah; Nicholas Tendongfor; Bachi-Ayukokang Ebob-Anya; Vivian A E Eta; Malika Esembeson; Ndzi Eric Ngah; Salisu Ango Abdul-Rahim (JMIR Research Protocols)