function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Grootaert, Patrick & Shamshev, Igor', 2],
    ['Liu, Xiaoyan & Zhang, Lili & Yang, Ding', 4],
    ['Menezes, Isis Sá & Ale-Rocha, Rosaly', 28],
    ['Soares, Matheus M. M. & Freitas-Silva, Rafael A. P.', 35],
    ['Wang, Guoquan & Wang, Ning & Yang, Ding', 6],
    ['Yang, Ding & Grootaert, Patrick', 5]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=80)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 6, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);