function drawChartTreatmentsPerAuthor() {
  var chartData = google.visualization.arrayToDataTable([
    ['Series', 'Number of Treatments'],
    ['Barbar, Ziad & Ueckermann, Edward A.', 1],
    ['Ebrahimi, Najmeh & Noei, Javad', 2],
    ['Eghbalian, Amir Hossein & Khanjani, Mohammad', 1],
    ['Hernandes, Fabio A. & Skvarla, Michael J. & Fisher, Ray', 1],
    ['Paktinat-Saeij, Saeid & Rostami, Aylar & Bagheri, Mohammad', 2],
    ['Rostami, Aylar & Bagheri, Mohammad & Jamshidi, Soleyman', 2],
    ['Wu, You-Fang & Jin, Dao-Chao & Yi, Tian-Ci & Guo, Jian-Jun', 1]
  ]);
  var chartOptions = {
    pieHole: 0,
    title: 'Treatments per Author (n=10)',
    fontSize: 'automatic',
    doWeHaveDanglingCommas: 'No ;-)'
  };
  if (window.customizeGoogleChartOptions)
    customizeGoogleChartOptions(chartOptions, 'TreatmentsPerAuthor', 'pie', 7, 0);
  var chart = new google.visualization.PieChart(document.getElementById('chartDivTreatmentsPerAuthor'));
  chart.draw(chartData, chartOptions);
}
google.load('visualization', '1', {'packages': ['corechart']});
google.setOnLoadCallback(drawChartTreatmentsPerAuthor);