Clin. nutr. Clin. nutr. Handgrip strength measurement protocols for all-cause and cause-specific mortality outcomes in more than 3 million participants: A systematic review and meta-regression analysis Núñez Cortés Rodrigo Cruz Borja del Pozo Gallardo Gómez Daniel Calatayud Joaquín Cruz Montecinos Carlos López Gil José Francisco López Bueno Rubén 2022 research-article