function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Guerra-García, J. M.', 1],
    ['Guerra-García, José M. & Lowry, J. K.', 1],
    ['Lacerda, Mariana Baptista & Takeuchi, Ichiro & Masunari, Setuko', 1],
    ['Lim, Jacqueline Hui Chern & Azman, Bin Abdul Rahim', 2],
    ['Momtazi, Farzaneh & Sari, Alireza', 2],
    ['Paz-Ríos, Carlos E. & Guerra-García, José M.', 1],
    ['Ros, Macarena & Lacerda, Mariana B. & Guerra-García, José M.', 2],
    ['Shin, So-Yeon & Lee, Chang-Mok & Heo, Jun-Haeng & Kim, Young-Hyo', 2]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=12)',
    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);