function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Cruz-Barraza, José Antonio & Vega, Cristina', 2],
    ['Domingos, Celso & Moraes, Fernando & Muricy, Guilherme', 2],
    ['Gómez, Patricia & Calderón-Gutiérrez, Fernando', 1],
    ['Lage, Anaíra & Muricy, Guilherme & Ruiz, César & Pérez, Thierry', 4],
    ['Rützler, Klaus & Piantoni, Carla & Van, Rob W. M.', 1],
    ['Schulze, F. E.', 1],
    ['Van Soest, Rob W. M. & Meesters, Erik H. W. G.', 1],
    ['Van, Rob W. M. & Kaiser, Kirstie L. & Syoc, Robert Van', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=13)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 8, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);